I like the look of the game, but I wasn't able to play too much, because my brain just cannot understand inverted mouse controls. The game also seems to lose my pointer if I press ESC and then go back in on the WebGL version.
Ah, I always get control inversion wrong. Let me quickly fix it and update a new version. The ESC issue isn't really something I can fix.
I've just replaced it with a version with new controls, please let me know if that's improved things!