I just tested with a low frame rate and indeed the jump is impossible, in reality it shouldn't do that, the game should have been possible with low fps, a windows version could have solved the matter but unfortunately I have submitted the game at the last minute and didn't have time to upload it, but thanks for reporting the bug, and sorry you can't play the game.
Viewing post in Turnip Castle jam comments
Thanks man. It looks cool I wish I would have been able to play it. Something interesting to note is you might be able to fix the problem by using fixed update for your physics calculations. I'm new to programming but I heard that doing physics calculations in update can mess up compatibility across systems. Thanks for the reply!