I think it's cool! You should definitely keep working on it, especially if you feel like it's helping you improve your skills as a developer. I like the way the levels flowed (I played to mission 5), they didn't seem too crazy difficult or too crazy easy. I would really suggest working on the hitboxes for things because the character will often get stuck on boxes and walls and sometimes I feel like I hit things when I didn't. The bullets should also probably be a bit bigger, maybe even add a splash of a bright or noticeable color as well. It's quite difficult to see and attempt to avoid them when they're so small and hard to see. Overall I like where you're going with it and would like to see you make improvements to it. I'd be curious to see what a more flushed out version of this project looks like!