It is a pretty solid game. My main complaint would be the aim, it could be better maybe if the character just shoot at whatever direction you are pointing instead of just at enemies.
It also has a bit of balancing issues, the fire spreads too quickly, spawns too many enemies, and atleast as far as i have played, there are items that extinguish the fire, but those were one time use items, but i think there should have been more consistent solution to deal with the fire, I don't mean completely destroy, that would be against the idea of the game, but atleast control it a bit more.
I will give you that the enemies themselves were properly balanced, didn't deal much damage, and died in a good amount of hits, though it became annoying when they spawned so quickly.
The graphics are really neat though.
But overall, pretty good job.