Steam News19 June 202617d ago

Unstable Nuclear Reactor Demo Launches June 22! ⚛️🎉

Hello Atoms! I have some massive news to share with you all today. The official Unstable Nuclear Reactor Demo has officially cleared Steam's review process and is completely approved for release!

In this update2

Full notes

Full Unstable Nuclear Reactor update

Read the full published notes in a cleaner layout. The original post stays linked below.

Repeated intro

Hello Atoms!

What changed

0 fixes1 addition3 changes0 removals

Gameplay
UI and audio

added🔬 Features Included in the Demo:Grid Expansion Loops: Progress through the board by achieving a targeted number of element merges to unlock new outer rings and expand your building area.

changed🔬 Features Included in the Demo:Skill Tree Progression: Earn points from your successful merges to upgrade your reactor systems and unlock permanent tools to help manage the grid and control higher-tier element combos.

changed🔬 Features Included in the Demo:Roguelite Mechanics: Push your reactor to its limits in run-based gameplay where you adapt to escalating difficulty, test different upgrade paths, and see how long you can survive.

changed🚀 A Huge Thank You!If you haven't yet, please hit that Wishlist button and share the game with your favorite puzzle and strategy game friends, it helps the Steam algorithm more than you know!

Unstable Nuclear Reactor changes

addedGrid Expansion Loops: Progress through the board by achieving a targeted number of element merges to unlock new outer rings and expand your building area.

changedSkill Tree Progression: Earn points from your successful merges to upgrade your reactor systems and unlock permanent tools to help manage the grid and control higher-tier element combos.

changedRoguelite Mechanics: Push your reactor to its limits in run-based gameplay where you adapt to escalating difficulty, test different upgrade paths, and see how long you can survive.

changedIf you haven't yet, please hit that Wishlist button and share the game with your favorite puzzle and strategy game friends, it helps the Steam algorithm more than you know!

I have some massive news to share with you all today.

The official Unstable Nuclear Reactor Demo has officially cleared Steam's review process and is completely approved for release! All three green lights are lit, and the countdown has officially begun.

📅 Official Demo Release Date: Monday, June 22, 2026

🔬 Features Included in the Demo:

Combo Chain Reactions: The baseline puzzle mechanics allowing you to drop elements, trigger atomic combinations, and watch high-scoring combo chain reactions ripple across the hex grid.
Grid Expansion LoopsProgress through the board by achieving a targeted number of element merges to unlock new outer rings and expand your building area.
Skill Tree Progression: Earn points from your successful merges to upgrade your reactor systems and unlock permanent tools to help manage the grid and control higher-tier element combos.
Roguelite Mechanics: Push your reactor to its limits in run-based gameplay where you adapt to escalating difficulty, test different upgrade paths, and see how long you can survive.

🚀 A Huge Thank You!

We recently crossed 360+ wishlists, which is an incredible milestone for this solo developer journey. Your support, clicks, and hype keep this reactor running!

Make sure your notifications are turned on, and get ready to download and play the free demo this Monday, June 22.

If you haven't yet, please hit that Wishlist button and share the game with your favorite puzzle and strategy game friends, it helps the Steam algorithm more than you know!

See you on launch day,

Mixer Studio Games

Source

Steam News / 19 June 2026

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