It's okay. Classic gameplay is fine.
Also, make 3D rocket more... distinct? It's hard to tell what it is from the first sight, since it blends with environment
Also, add recharging of shields, to extend game somehow, and to simplify it
you can recharge shields using the last powerup called "wtf???". that's a gradius reference. there's a shield powerup in gradius and it's called "?".
actually, i'm kinda sorry for making last two games. i made them as a form of coping through art so they're are just shitposts. the fact that it is somehow playable is a miracle. now i feel better so i'm planning to make an actual competent game, so stay tuned