Interesting and original game. Complex mechanics, I somehow completed the game without fully understanding them, just trying what works on each block that stood in the way. If there were more and harder levels perhaps it would force me to remember mechanics properly.
Enemies are often too difficult to avoid especially in 3rd level. In most cases I just kamikazed in them and next time they were gone. After clearing level by kamikaze attacks the 3rd level was much easier then 2nd. I think this was not a good way to make it. It would have been better if avoiding enemies was easier but enemies respawned together with your ship so player had to complete level properly.
Aside from balancing out how enemies work this game could also be longer to deserve a higher score. 3 levels is really short and first level is basically just a tutorial.