Congrats on your submission! Great music, awesome controls. I think I ran into a bug. After running through and dying 3 times and getting upgrades, I was able to run around and kill everyone. I kited one of the mobs from behind the door and it died at the end of the hall and the key is in the wall sort of. I'm attaching a screenshot so you can see what happened. I wasn't able to pick it up or do anything else except die on the spikes. I went to the last stand arena and killed over 200 mobs and let myself die. I wanted to see if I could buy all of the upgrades and I bought every upgrade except the God mode one and I still had 24K left. I don't have time to keep playing, or I would get the God mode just to beat it.
Edit: for some reason I could not attach a screenshot and the game screen has changed, so I can't provide the screenshot.