Thanks for the review.
Yeah, enemy diversity is lacking as of now, I made it so it was quick to implement but it really needs improvement. I've been thinking of some different enemies types and now that I've figured an efficient way to make attacks, I think I'll be able to do it much better.
For the controls, I thought adding two new buttons for up and down would be overwhelming, but that is actually not a bad idea... I'll have to make some tests.