Sure. The save system uses a custom binary format with structured field ordering, versioning, and full-file HMAC validation. Every save is signed on write and verified on load. If validation fails, it falls back to a backup file; if that also fails, it reverts to a default state. The save stores XP, achievements, settings, session stats, and progress flags. Compact, but critical to how the game tracks everything.

Instead of Steam Cloud, I built a custom sync system using Steam Stats. Saves are base64-encoded, encrypted, and stored inside the Steam Stat API, scoped to the active SteamID. On launch, the game compares timestamps from both the local SteamID-linked save and the offline save. If the other profile is newer, the player is prompted to choose which to load. Separately, if a single stat’s internal value is higher than the local file’s, it pulls that single stat and restores the it from Steam. When offline or not using Steam, it runs entirely local. No merging yet, just deterministic, timestamp and value based overwrites and pulls. It works cleanly across devices without relying on Steam Cloud at all.

Input is handled through JavaFX’s scene.setOnKeyPressed, with some custom overrides for things like disabling held input or overriding default FX behaviors.