Ahh, well Suno AI is as good a source as any, that should (hopefully) be fine.
As for mechanics, you could also consider powerups like a one time use bullet shield, or perhaps a recall powerup to warp to a preset or random location for quick get aways, or a time slow powerup to temporarily slow the bullets down, etc.
As for art, I can appreciate the sentiment. I tend to make all my own artwork as well, and working on a project is great motivation for improvement. But again, I wouldn't say your artwork is bad, just basic. Either way, i'm sure you'll do fine. ;)