I find fighting fire with (what looks like) fire funny. :)
I like curve-walled rooms. At first exits were confusing because they were wall-colored, so perhaps a clearer indication that it is leading to another room would be a nice visual improvement. There was an upgrade that said ammo increased, but nowhere does it say how to attack besides the melee weapon (nor did any key seem to work to fire any kind of projectiles). An ability to fend off enemy projectiles would be nice/add to have because there are no ways to defend from them besides the dodging (which is not an option if going to attack the enemy which fires them).
Boss fights were surprisingly intense for something so simple. :)
I see that this is still a work in progress (even the yellow tapes indicate so), but even so, well done so far. :)