While not Full Body , the original Catherine Classic is available on Steam for $29.99 (often on sale for $9.99). It runs at 4K 60 FPS, includes all original puzzle levels, and has full mouse/keyboard support.
Excellent performance even on mid-range PCs; many users report a flawless 30 FPS experience. Pros: Fast loading times and a user-friendly interface. Catherine Free Full Body Pc Emulator
Set the to 2x (1440p/4K) if you have a capable dedicated graphics card. While not Full Body , the original Catherine