Play 1.0 Version Now

Dear Explorers, The 1.0 full release has been released today, and it’s now available at a 30% discount for a limited time! The Steam Workshop for the game will go live alongside the official release, allowing players to customize character appearances, Monster Girl outfits, and modify various in-game stats, enabling you to create a personalized underground world. Mine, build, and explore with Monster Girl companions in this underground sandbox adventure. Uncover lost tech, automate production, and forge bonds with allies as you fight to survive and journey back to the surface.

Version 1.0 Update Overview

Final Chapter: Core Level 8 Opens!

The final step - Core Level 8 is officially unveiled!

Truth and ending await here. Are you ready to face the ultimate choice?

Workshop Support

Modify character appearances and game data to craft your unique underground world!

More modding tools and tutorials coming soon - we await your creativity!

Performance Enhancements

Faster loading and smoother gameplay - no more frustrating delays.

Asynchronous save system - no more interruptions during auto or manual saves.

Pickaxe Base Complete Overhaul

Amplified pickaxe now boost ALL pickaxe-based abilities! Each amplification provides unique effects - experiment with creative combat builds!

Monster Spawn System Revamp

Surface creature nests will regenerate every night at midnight! Will this create greater survival challenges or new opportunities? The choice is yours!

Monster Girl Affection & Interaction Enhanced

Mood System: Monster Girls now have visible mood indicators that respond to your interactions!

Enhanced Interactions: New gesture system makes building relationships more engaging and intuitive!

Quest & Affection: Complete personal quests for Monster Girls to unlock exclusive storylines and rewards

Cooking Upgrades: Cook mood-enhancing dishes to keep your companions happy!

Relationship Rewards: Higher affection levels unlock better shop prices and practical benefits!

Entertainment District Expansion

New entertainment options including CD players and cassette tapes! Music boosts Monster Girls moods - transform your base into an underground haven!

Improved Storage Management

New secondary classification feature! Set up filters for instant access and automatic sorting by Monster Girls. Say farewell to cluttered storage and inventory chaos!

Cannon & Bomb Upgrade

All explosives can now be crafted and fired from various cannon barrel types, opening up new tactical possibilities!

Expanded Talent System

New Monster Girl Talent Line enhances cooperative combat abilities with companions.

Optimized existing talent nodes with more practical effects for richer build gameplay!

Batch Crafting System

Mass produce items (torches, bombs, etc.) instantly and say goodbye to repetitive clicking.

World Generation Modification

Increased underground vein quantity.

Additional save slots provide more backup options for fearless exploration!

Monster Girl Behavior Logic Optimization

Entertainment, farming, and daily behaviors more intelligent with better pathfinding - less wandering, more productivity

Monster Girls can now participate in insect farming!

Construction Detection Refinements

Buildings can now be placed around NPCs and Monster Girls without disrupting their activities.

Quality of Life Improvements:

Enhanced Mini-map: Monster type indicators now visible at a glance

Smart Bed Assignment: Monster Girls automatically return to previously assigned beds when returning to camp

Fish Tank Expansion: Fish tanks can now hold more fish

Storage Box Alerts: New notifications when storage boxes are full

Base Initial Range Expansion: Increased initial construction range for small bases

Task Click Area Optimization: No more accidental clicks

Cannon Firing Optimization: Hold cannon barrel for continuous bomb firing Below is a summary of the major optimizations made since the Early Access release. Let’s look back on this journey toward the surface together! Steam post image