Wow this was really such thoughtful feedback, thank you so much for taking the time to do this. I'm new at releasing things online so its really so helpful to hear people's critiques as I iterate the prototype. I'm taking a lot of this into consideration for the next version! I had enemies in an earlier version but I didn't like how they turned out so they've been on the backburner. And I agree about the animation. It's really hard for me to get a sense of how hard or easy the game is since I play it so much during development, so that is really helpful too.
Thanks again, and I'm happy to return the favor with some thoughtful feedback about whatever you're working on if you'd like!