Regarding version 0.0.3. On a Linux (Pop!_OS 21.04) system with an RTX 2080 GPU this game easily hits 120 FPS the same as the monitor refresh rate. But on a Linux system with Radeon Vega Mobile Gfx graphics I’m lucky to get 10 fps at which point the game is not playable. I’m liking the look and feel of the game. I’m optimistic that GPU performance tuning will improve as game development proceeds. I really appreciate the Linux build of this game. All the best!