This was fun ! I love the idea of going up & down (mostly down at first) and upgrade your ability at each round. It's really addictive and makes you want to go down a few floors just to get more upgrade before the final boss, I loved it. I just wish there were something to show you where ennemies will spawn because I ended up dying a lot at the beginning simply because they all spawned over me haha! Also sadly I encountered a bug where my character simply disappeared from the screen :(
Nice job !