Thank you for the comment! I especially appreciate the granularity of your feedback. The boss being too easy is a result of some of the planned features not being implemented for time. The spikes should be an easy fix, and will be high on my priority list for a post-jam update.
TBH this comment has made me think a bit more seriously about doing more than just a small post-jam update, and I'm super thankful for that! I've started getting ideas for more mechanics and weapons. I think a big thing restricting me with its current design is the limited level size, so that'd have to change, too. That being said, if you want to tinker with a similar game, by all means! It's not like I own the idea of a puzzle-platformer based around throwing stuff.
Thanks for playing my game! I'm glad you enjoyed it!