Thanks for the feedback! The last level is quite long, maybe a bit too much. If any level makes the game need checkpoints, it is surely that one. I wanted a bigger challenge for the last level, but in hindsight, making it longer isn't a very fun way to add challenge. I think I spent a bit too much time on that level and didn't give myself enough time to test it out. I do agree that the enemy hitbox needs a bit of work, in my playtesting I also found that I would sometimes die when jumping on one, and it felt like I should've stomped it.
I do feel a bit bad about the spikes on the bottom of the pit, I should probably ditch that in a later update since the few people I've seen play the game were annoyed by it or simply didn't notice it at all.
Anyway, thanks for trying out the game and for leaving a detailed review!