Thank you for your kind words and congratulations on reaching the end!
I completely agree with both points. I am sure the difficulty spike was fun to some, I think we could've added more checkpoints as you said to make it more accessible which fits a gamejam better.
Personally the thing I would like to update the most (I did only the programming) is the way how the boxing glove works, as the way it works now is actually not the intended effect haha.
Hopefully next time I can program even more stuff and make it more polished than last time! :)