I got idea for a name for this game. SCRATCH INVADERS

This is a pretty fine start! There is some good variety in obstacles and, with some polish, you could create a seriously addicting game loop.
If I could provide some suggestions for improvement:

Other than your HP number, there is no visual or audio feedback on if or when you get hit. You could add an explosion, a meaty *CROMMCH* sfx, a brief freeze frame to rub it in, or really any combination of the above you wish! Anything to get the player to realize "oh shit, I just took damage!" cause otherwise one could easily breeze through without noticing and then suddenly die.

Also, some brief invincibility after taking damage is nice so the player doesn't get dunked on if they drive into multiple rocks at once.

The aliens work well to shake things up, but their spawnpoint(?) is inside the playing area where the player could unwittingly sit over them and suddenly lose health. You could either add an indicator over where they're gonna spawn to give warning, like a machine or a portal, or you could move their spawn area outside where the player won't be hanging out and just have them move in from offscreen.

Finally, you could add in some goal to encourage the player to improve at the game. Maybe a timer if you just want the player to survive as long as possible, or a number score for shooting stuff. Or something else. If you do that, you could also have the difficulty ramp up over time to make the later game more challenging.

Welp, that's a lot of text. Hope this helps!

Very cute game, good job