Wow, thank you so much for the detailed feedback! (And don't worry, I don't take it that way! Feedback and criticism is great for improving things, and I'll definitely be using this in a post-jam update)
I agree about the spikes and their implementation being a tad off. They were added fairly close to the deadline so I couldn't polish them as much as I would've liked, but I'll definitely take all of your suggestions for the post-jam update! Like making it to where the spikes can't hurt you until you're actually on the ground instead of while you're rising, making them appear sooner, etc. It's all really helpful stuff and I appreciate this detailed comment! And thank you for playing the game :)