downloadable version doesn't work because it's missing Unityplayer.dll. This may be helpful. Online version doesn't work because you constantly take damage when changing direction for no discernible reason.
ohmy thank you for letting me know. I completely forgot to add the unity player dll! I found that hotkey I had left in from testing this back in 2018, when I thought I would be a mobile exclusive.
I just updated the files for both! Everything should be working :3