This is a very interesting entry. Took some time to figure out what should I do, but eventually understand how the bullet works and finally can have a good time playing the game. The difficulty goes up quite quickly and would really requires skill to beat. Overall I'd say this is not bad at all!
At the same time, I'd say the controls are a bit not intuitive enough, especially when the bullet is not flying directly to the right. For example when the bullet is traveling upwards, people will normal going for the right key if they need to turn it clockwise, but then that accelerate the bullet instead. I also doesn't help with the fact that you really need that kind of controls when enemies are quite near, and both of them will just exaggerate themselves leading to a unsatisfying lose.
Anyway, this entry is still solid enough, and I think you did a good job!