I'm really glad you like my game. It's definitely too difficult at the moment, even though I was aiming for 'challenging'. I showed it to my partner a few days after the jam and even I couldn't get back from screen two after around 3 tries, so that's pretty telling!
I'm going to do some more work on it, I think. I'll add some 'intermediate' floors that appear before the harder, current ones come along. That should help with the time limit a bit.
I like another commenter's ideas about ability pickups (double jump, dash, turn in the air) and I'm considering how to add those and whether they'd be permanent additions (a la roguelite) or just for the current run.
Thanks for hosting the jam!