Hi ! Thanks for the game :) Here are my thoughts
- The character controller is way too slow and behaves strangely : collisions are visually incoherent, animation speed is not right compared to actual movement speed, and the thing that was really annoying, and that is, in my opinion, the main issue of the game, is the bullets speed and fire rate. Like, I ran faster than my own bullets and it seems I could shoot only 1 per 2 seconds or something, which was really boring for a shooter game like it. What you can do, is multiply by 30-40 the fire rate, and multiply by the same value the enemies health points, so that you will kill them in the same time, but with more speed, more particles, more shake, more juice !
- The level design is a bit too big. Corridors are huge, there are no landmarks so you can easily get lost, once I got stuck inside a corridor because of hitboxes (despite the corridor being large), and at one level, I believe the last one before the boss fight, the teleport point was at the beginning so I had to backtrack everything. Not sure the levels are procedurally generated though.
- I did not understand the buff/debuff system, the only thing that I saw happen is the input direction flip, which was, to be fair, just boring as there were no feedback at all and it felt like a bug more than a debuff.
- The boss fight is too easy, I killed him in 3 or 4 hits. It was disappointing because he looked really cool !
Overall a lot of things could be enhanced, but those are the main points I wanted to share.
And I guess that's it ! Sorry if my feedback sounds harsh, but I believe honesty is the key to get better at game development !
Still, making a game is always hard and you did it, I think it's important not to forget it, so congratulations about that :)