Update:
Now it's playable. I ran into the issue that no more enemies spawned and I was seemingly locked in level 2 but the game cleary fits the theme and the core gameplay can be tested (and I could beat some nasty seat snatchers too). I'd add walls left and right of the arena.
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I had the same experience as @yhpah. The character sprites look unique and interesting, the music sound fun but unfortunately it's unplayable due to the ui being cut off.