I've played 2 levels. Shooting kind of feel painful because I have to repeatedly press the shoot button while  also tapping space to manage the plane position.
I'd suggest you either let the player shoot automatically while holding the shoot button, or let the player manage hovering by holding space, so we only tap frantically one button and manage the other one differently. ʕ´•ᴥ•`ʔ

2nd thing is I'm not too certain what you want the player to accomplish, first level make me destroy everything around the goal, second just needed me to expose it.

I'd say go with the 2nd level type of objective (just expose the block) as it'd be faster to clear levels. I think blocks have slightly too much health right now, but maybe that's just me ʅʕ•ᴥ•ʔʃ

Game look pretty clean, already really close to a "product" level, it just seems a little bit purposeless.

I think adding more "Oomph" (particles, sounds, explosions) and physic based destruction would make really fun to play. 

This or a way to make  the gameplay snappier.

Hope it help, I see potential in that ʕ/　·ᴥ·ʔ/