This game is very popular for good reason! The difficulty took some time to get used to but I quite enjoyed my time with it.
The good:
Generally high immersion. There is strong art direction with sound and art working cohesively well together. Your team is clearly very experienced and it shows in here.
Gameplay is simple and works fine with the theme. A constrained arena is okay on its own but I applaud the effort at making the unique 'screen-wrap' mechanic.
The game gets very hectic but once you've learned on spamming the dash mechanic (there's kinda no reason not to), it does get you on the edge of your seat and makes you wonder 'how am I still alive?'
To improve:
The only thing is probably the difficulty ramping. I think there is a lot of subjectivity from what I am about to say.
The constrained arena feels very uncomfortable and way too claustrophic than I liked for the amount of bullets on the screen. This feeling lessens with time and experience. Hence, the difficulty ramping on the beginning part of the game should be tuned a little bit on the easier side so that players can ease into the game better.
Also honest question, how did you achieve the 'bubbly' effect of your health bar and the darkness. Is it through shaders? The art is great and would really love to know! Thanks in advance!