Thanks for the feedback!
Yes, the graphics are vector-based—I made them myself in Inkscape.
The shooting mechanic actually comes from the original idea for the game. It was supposed to be part of a boss rush game jam with the theme 'spin.' I didn’t finish it in time for the jam, but I kept the mechanic because I felt it made the game stand out a bit and gave it a unique feel compared to other games.
Thanks again for your feedback, it really means a lot to hear opinions on my work!