I know the intentions of the chosen controls were to make this game feels more 'retro', but it needs to be polished (or just change the control system). Other feature I've noticed is the lack of physics the bullets have (the bullets should go in a certain direction, not at everywhere), it's a bit frustrating to play. The last detail, music and sound effects can make a difference.
Not really bad, but it needs more work.

This is one of the worst control systems I have every seen in use. This is frustrating to say the least. The lack of sound, or music of any type are also annoying. What was that green bar that appears when you shoot something. Do they rot like this game before exploding? Flying off the screen into oblivion is a bad bug. The are was not very good. There was no part of this game that was executed well.