It's a really nice idea with how your gun jams, dud bombs, and power-ups just not working sometimes which adds a bit more of an internal or mechanical struggle then just your enemies. I think the visuals are solid and it's very on theme.
While the game is quite challenging, which I like, it feels pretty unfair a lot of the times. Either lessening the repercussions like adding more health/shield or making it easier to avoid enemies and bullets could help a lot with this. Another thing to consider would be adding or variety which could be with more and unique enemy types, different types of obstacles, or different powerups. A thing that would work really well is a score counter for every enemy you kill or a timer for how long you last.