Thanks for the reply and happy that you liked the game! The idea was that the game would be easier the more upgrades the player got, most of then are optional, you just need the wall jump, either the double jump or the stronger jump, and the ceiling run. Trying to keep the difficulty the same would be rather hard (at least in the time frame, maybe with some weeks of research for other types of challenge it could be easier) but I fear it would end up beign similar to the final boss:
(I had to hold myself to not name the second boss Dracula Hatake)