I tried the dropbox build you posted, still seems about the same as before, consistently bumping into the platform if my legs are near the side as I try to move toward it. I thought maybe alt+enter might make it fullscreen and maybe I could have my monitor show what FPS I'm getting but I guess that doesn't work on Godot games.
Bad news about respawning though: every time you hit Enter things still get darker. Just press it really fast, the game bugs out pretty hard for a while hehe~
I wouldn't worry too much about that one, anyway. A button to respawn/reset is more of a debug feature, not really part of normal gameplay.