This was actually one of the first I played, but meant to leave a comment. (It was the night of submissions so I was wiped :P).
Came back to play again... and dang, I love it even more the second time!
Your use of the colors... to add depth and for everything to read clearly is remarkable. That is a lot of info, and it all reads so well. I think this one had some of the best use of the 4-color palette in the jam. The art, animation, sound and music are just fantastic!! I'm blown away by how much you were able to pack into a jam game. It's a bit mind-boggling. And all so polished. (I love the music on the second stage too).
When I first played, it took me a sec to realize I needed a second 'press' to activate the choice. So for a bit, i just sat there waiting for the game.. then realized I needed to press it again. But once I got past that, the pacing felt a lot better :D I loved the strategy behind it. And the constant upgrades and variety to keep things interesting and constantly progressing. (Again, I don't know how you pulled it off) :P.
Also... the fact I could play it all seamlessly on controller really added to the GB feel and made it so enjoyable. So good!!
Incredible job!! This is one I'll keep coming back to play just for fun.