The idea's unusual, and the gameplay's fun, I like it. My main issue is with the controls, though, it's hard to move the ship where you want it to be, and its hard to flip it, so it shoots in the opposite direction. I would suggest trying the following:
- Instead of using WASD to move the ship in 4 directions as long as the line allows it, use two keys to move ship along the line, and one other key to flip it.
- Smoothing the line so that it doesn't have sharp bends in which you can't get your ship at a right angle to shoot the enemies.
Also, the weapon seems to be downgrading itself off its own accord, I don't understand how it works.