I think the stylized graphics are super nice, and it's a well-made game overall, but if I were to focus purely on the gameplay, I'd definitely have some comments.
– Why does the screen shake so much? It genuinely almost made me dizzy until I got used to it.
Also, this is a game about precision, if the screen shakes, it increases the difficulty, but for the wrong reasons.
– “Collect the coins” – uh, there were coins?
– I wouldn't rotate the health bar. Usually in other games, even when your character moves, your health bar remains firmly horizontal. And since most things kill you either instantly, or after three hits at most, you could even do away with the health altogether, and show the damage on the ship itself (e.g. by adding cracks, smoke, or recolouring parts of the ship).
It's still a very lovely game to play for a bit, although after finishing the first level and going through a tight tunnel in the third level, I felt like I have seen everything, and nothing new was introduced in the remaining levels until it was over.
I'd consider adding a bit more challenge at least to the final level, something you haven't seen before – like rising lava, flying upwards, moving enemies; something like that.