Thank you for testing our game, and for your feedback! The pause menu was a little bit of a last minute-fix, so I'm not surprised it didn't work. Unfortunate :(
You're absolutely right about the jump function as well! It should be shown at the very least when you enter the third level. We managed to squeeze it into our itch page before release, but not into the in-game UI
Thank you again for taking the time to play our game, and to comment your feedback. We appreciate :D