A simple game, I like it. Maybe after the game jam you can put in some explosions and particles, more enemy types are also welcome. I liked the mechanic that your shot bounces back as an enemy shot at you.
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Actually, from when I started making the game, my concept was "limited misses" and in the start it was supposed to kill you after some misses, but it was too boring, so I made the mirror mechanic, so it's a real bullet hell. Maybe I should update the jam page because I wrote the theme wrong (I wrote the theme was limited movement, but it was limited misses)