Since you asked...
This game has potential to be superfun. The worm moves in a very nice way and you can learn to use that as a shield sometimes. The enemies aren't bad and, even though they follow patterns in movement, they can still provide challenge.
but...
That challenge should not rely on the fact that you fire weak bullets at a slowmotion ratio. Someone suggested an upgrade system, which would seriously improve the game. It doesn't have to be too complex: manouverability, shot damage, armour, fire rate. 4 possibilities of upgrading that add strategy and interest to the game.
Be bold, add weapons you can buy and upgrade. And then make the enemies increasingly hard.
As it is I didn't bother picking up money or bonus letter as it usually ended up with me bumping against some evil little nanobot. But it would be worth the risk if money meant upgrades.
This could be superfun, really. You've got talent, it's well encoded, so get to work and upgrade the game. Congrats!