Wall of text, OMG. I really like the look of the enemies. They would fit right into my own game. I had some issues with the combat, my keyboard doesn't accept more than 4 or 5 inputs at a time, so if I wanted to shoot and move with more than one gun, I would have to pause shooting, move, then shoot again. I also found it annoying that you could only shoot forward, when most of the time the enemies went way above or behind you. And each combat section feels like it takes a bit too long. As it is, I don't think I would be able to finish the game in an hour. Too much waiting for enemies to spawn, then being overwhelmed by them and having to retry.
I can tell you spent a ton of time working on this, and the upgrade system is super complicated, but I feel like the core game-loop was just frustratingly slow and difficult, and I couldn't explore it. Maybe its just me?
I do like the art and the sound.