Things that bug me (pun not intended):
Clicking out of the windows does not pause the game, potentially adding time to your record.
Alt-F4 is disabled. I use this to quickly close windows.
Sometimes you can flip in midair just after you drop off a platform. Most visible in Trench Warfare, when attempting to get the trinket the "fast" way.
Not necessary, but the trinket get sound has changed. Also, you don't get momentum when moving (was a bug).
EDIT: When pressing both left and right arrow, left takes priority. Can you change it to make it so the key that was the latest pressed comes in priority?