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Standard Issue Games · 20 Jan 2026
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English
Sphere TD is an RPG tower defense game that combines strategic base defense with deep tower and projectile customization. Players build and upgrade towers, modify projectile behavior through a wide range of systems, and progress through handcrafted stages, endless mode, and a large world map. The game emphasizes experimentation, long-term progression, and replayability through its buildcraft, resource management, and progression systems.
Try the demo to get a sense of the deep tower buildcraft, up to Tier 3 mod research. You can easily transfer your progress to the Early Access (or mobile) version via the in-game cloud sync!
This is a complex but rewarding TD. Featuring high replayability (Top 100 cadets have spent 110+ hours), deep RPG builds, with roguelite and incremental elements.
You will need to build EVERY tower. No presets.
Defend your base, ideally by spamming hundreds of projectiles down the sphere's path.
Pick ModCards for a small (or legendary) boost to your base or drone tower.
After action report means building more towers. No sleeping on the job, cadet!
Destroy spheres for profit or just mine ores. Are your towers are up to the job?
Got rich from mining? Here's how to spend your gold. More theory-crafting and actual crafting.
The Galatium Academy allows Cadets plenty of freedom and free time in the Sphere Simulacrum.
Join the Galatium Academy (for profit organization) for a career in Sphere TD!
Spheres are invading Earth-25. Build your towers and mod your projectiles — split it, add it, bounce it, chain it, multiply it! A true 1 tower = 1,000,000+ builds. Min-max tower, craft mods, pick ModCards, fly drones, mine ores, idle and enjoy the music, the choice is yours.
Build & mod your towers and projectiles! Nothing is premade!
39 towers with unique layouts and functions.
33 mods, each with tiers, MK upgrades, a B-Side function, and 3 unique perks
Research, advanced mod crafting, and long-term progression.
Tower inventory and energy management.
50 hand-crafted levels, endless mode, and map-specific challenges.
A massive world map with 52,000 nodes and procedurally generated setups.
Play offline. Online features like cloud sync and leaderboard are also supported.
10 years of support. Build the game with me. You want it, I'll make it.
Cross Platform (desktop and mobile).
The Steam version is a premium big screen experience (no IAP), and has the same features on all platforms.
It comes with the Galatium Express Token:
Hi! I'm Alex, a solo developer, and I'm excited to show you my first game, Sphere TD. If you enjoy tower defense, RPG theorycraft, factory/puzzle builds, roguelike choices, and incremental progression, you should feel right at home. If not, hop over to our Discord and I'm happy to answer any questions you may have. :)
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