This is a really tough game, but a well made one! I love the playable tutorial and you have great game feel on taking damage! Play Wilhelm Scream made me laugh a bit.
One piece of criticism I have is you can take a lot of damage if you get caught in a corner while the arena is spinning. It killed me quite a few times on the second boss and I'm not sure if there's a good way to get out of it.
Awesome job!