Arcade 2D arena game with characters, abilities and enemy blocks, plus daily challenges, replays, GIF export, online leaderboards and workshop levels. The code is a deterministic fixed-step simulation with many Entity2D types, rendering helpers, audio and haptics mixers, and a large Razor UI layer that drives menus, score screens and leaderboards, with persistence to local settings and calls to sandboxed Services and a couple of HTTP JSON endpoints.