Cover for Esterium Project

Esterium Project v0.005

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Esterium Project is a adult rpg game made on the Ren'Py engine by Kosmos Games. It was first released in August 2025 and last updated in June 2026. The game runs on Windows, Linux, Mac and is available in English, Russian.

Overview

You can choose the protagonist's class and backstory. There aren't many options yet, but more is to come. Currently, the game features an inventory and trading system, crafting, a detailed quest log, dialogue, and location exploration. The leveling and combat systems are still in the prototype stage, but you can already kill a skeleton. There are also a few explicit scenes.
Unlike traditional text-based RPGs, I want to move away from the concept of long, sprawling text. At the same time, I'll try not to lose the depth of the story and characters.​

Features

Players can expect content tagged rpg, sandbox, text based, turn based combat, 3dcg, big tits, character creation and female protagonist.

Frequently Asked Questions

Is Esterium Project free to download?

Yes — you can download Esterium Project for free using the download links provided on this page.

What engine is Esterium Project built on?

It runs on the Ren'Py engine.

What platforms does Esterium Project support?

You can play Esterium Project on Windows, Linux, Mac.

What language is Esterium Project in?

Esterium Project is available in English, Russian.

Screenshots

Download Links

These links lead to external hosting providers. Use at your own risk.

Developer Notes

The Esterium Project Concept:

  • A text-based RPG set in a fantasy world with sandbox elements

  • Aiming for maximum player freedom — explore the world as your character's strength allows

  • A world that will be filled with quests and activities

  • Combination of text-based storytelling and visual elements (character images and key scenes)

  • Lots of NSFW content

How This Project Differs from Bright Past:

  • Fantasy setting with magic and mysticism instead of modern realism

  • Create your own hero instead of playing a predefined character

  • Non-linear storytelling instead of a strict storyline

  • Focus on RPG elements and exploration freedom

Future Plans:

  • Expanding the starting area

  • Adding new NPCs and items

  • Deepening existing mechanics

  • Gradually creating an extensive world that players will want to return to

Changelog

v0.005

  • A new (or rather, the first) dungeon with 19 locations.

  • Completing this area has several variations and possible outcomes.

  • 1 new regular enemy + 2 bosses

  • 1 new NPC. Her fate depends on you

  • 1 new armor that must be collected piece by piece and crafted at the blacksmith.

  • 2 new weapons + 1 new lightning rune

  • New items for looting, selling, and future crafting.

  • Notes and books system.

  • The male protagonist has returned.

  • 1 new hairstyle for each gender.

  • Added the ability to view dialogue history.

  • Updated interface with more detailed descriptions and tooltips.

  • Improved images of Taira and Shii’da in intimate scenes.

Combat:

  • The base dice roll has been changed. 1d20 is now 2d10. A critical success occurs if the roll exceeds the Armor Class by 5.

  • Not all battles now end in death (a special note will be displayed on the battle screen). Sometimes, a defeat advances the story. However, you will not receive experience for enemies killed by someone else.

  • Turn order display.

  • 2 new combat effects: blind (provides disadvantage to attacks) and entangle (removes 1 action point).

  • 2 new combat items: anti-bleed bandage and antidote.

  • Ability to craft poison and apply it to weapons.

  • A pickaxe can now be used as a weapon.

  • Ability to catch an enemy off guard.

  • Ability to switch weapons during combat.

  • Several combat bugs have been fixed.

v0.004

  • Progression system

  • You will now gain experience for killing enemies and completing quests.

  • As you level up, you can improve skills and attributes.

  • Currently, you can level up to level 3.

  • Each level also increases your maximum HP.

  • The male protagonist option has been removed.

  • A schematic world map has been added.

  • World concept changed: characters no longer resurrect infinitely.

  • The ability to use magic has been added

  • The key attribute is Intelligence.

  • You will need to use special runes.

  • One of them can be found in the game world.

  • Campfires and sleeping

  • Campfires can be lit if you have kindling materials.

  • You can sleep near a lit campfire.

  • To sleep, you need to have some food in your backpack.

  • Sleeping restores HP and action points.

  • Sleeping refreshes some of the loot in locations.

  • Sleeping skips time by 1 day.

  • Many UI changes. Most NPCs are now displayed on locations.

  • A new enemy type with new abilities.

  • Several new locations.

  • New goods.

  • 2 new female NPCs.

  • One new face option for the main character.

  • A new menu with all character data has been added. This is also where stat progression will take place.

  • A new ring for the character that reduces bleeding duration.

  • New loot items.

  • Armor slot changes.

  • Hotkeys have been added to open the main menu sections.

  • The English version has been redone from scratch. Fixed places where Russian words appeared.

  • One new quest from Ash.

  • You can find money in containers. You can also take everything at once.

  • Updated main menu background

Tech Demo - v0.0003

Character Creation:

  • 4 body types, including 2 male, 2 female, and 2 futanari.

  • 3 face types for each body type.

  • 2 hairstyles for each body type, 3 hair colors.

  • You will always be able to see your character, including all of the above features.

  • Enter your character's name.

  • The character will also display the equipped armor. In addition to the starting loincloth, you can buy leather armor from the blacksmith.

  • 12 different origins that affect starting characteristics and some unique dialogue options.

Updated Interface:

  • New background

  • Pop-up windows with detailed information.

  • Equipment rework. Gloves and pants are now part of the armor set.

  • All icons have been redrawn.

Combat System:

  • Action point system. You have a total of 3 points. Attacking costs 2 points, and you can spend one point to drink a healing potion.

  • Special attacks and special status effects system. Currently, there is one weapon capable of inflicting bleeding.

Others:

  • 2 new weapons. One you can craft, and the other you can take from an enemy.

  • Several new locations and 1 new female character.

  • Tyra's appearance has been changed, as has the scene with her.

  • Improved trading system. The selling and buying prices now differ. The markup amount will depend on the NPC's attitude.

  • You can learn something about the laws of this world from Cinder.

  • In the Russian version, the gender of the main character is taken into account in the dialogues.

  • Work is also underway to adjust the game's lore.

  • In general, there are so many minor changes that I don't see the point in wasting your time. It's best to just try playing the game and share your opinion. At this early stage of development, your feedback is especially important.

  • Known issues: There are some localization errors. A few lines in the combat log may not be translated. If there are too many untranslated lines, change the language in the settings, restart the game, and start a new game. That should help. I hope to fix this problem in the near future.

Known issues: There are some localization errors. A few lines in the combat log may not be translated. If there are too many untranslated lines, change the language in the settings, restart the game, and start a new game. That should help. I hope to fix this problem in the near future.

Tech Demo - v0.0002

Tech Demo - v0.0001 - Initial Release

  • Basic character creation system

  • Simple resource gathering mechanics

  • Inventory management fundamentals

  • Equipment crafting system prototypes

  • Initial version of the combat system

  • Simple quest system

  • Interaction with one NPC

More links may be in the source thread (registration required).

Source Thread

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