Thanks for playing! Hmmm that's weird, does your device support touchscreen? I forgot to disable a touch emulation project setting. I tried to make it so you click to enable and esc to disable the mouse capture.
I don't have a touch screen. Last week in another game jam their was a 3D game with the same issue and I was not the only one with it. I have read that Godot has several pitfall with mouse handling. I checked my mouse with a tool and it has a rather high frequency of 593 Hz.