Worth Waiting for
I give it 10/10 as a rating of how awesome I know the final product will be.
Other than that, I repeat what the other guys said about conservation of momentum for projectiles and some form of notification that your ability to ram is ending, and would like to add:
Since those little trailing orbs represent your lives, maybe have them do something when you lose them. For instance, explode and kill the orb thingy that hit you...
Put shit in the way! (A straightforward way of saying: have objects in the levels that alter gameplay--walls, tracks that speed up/slow down you and/or your projectiles, maybe mines that you can shoot at to blow up nearby enemies & yourself if you're not careful, etc.)
Group behavior in the smaller enemies.
Extra lives as a power-up.
Different point awards for differently-sized enemies.
Overall, again, good game.