Great little game, gets super fun when you get full sword and heat upgrades and just go crazy all over the arena, not even touching the movement keys. It would be awesome if the game continued to ramp up once you get those upgrades, and also if it was rebalanced a little. The sword is useless before getting upgraded as enemies do not stop shooting/attacking when you hit them and the shooting ones make no visual indication of when they'll fire at you. Also, the gun stops being useful after the sword is upgraded because the upgraded gun still takes 2-4 shots to kill whereas the upgraded sword only takes one hit to kill.
Anyway, had a ton of fun with it and I hope you'll continue with this in the future.