Nice game! I got to level 5 but stopped there because the scrolling gets hard for the eyes =)
The idea is pretty cool and the arcade style well done.
As possible improvement I'd see:
- alternate keys (I have an AZERTY keybord and I play with Q and D, not A and D, you could have Q and A for left, but also allow for the "right" and "left" keys, that still counts as a 2-button game)
- a way to make the scrolling easier on the eyes? I'm not sure to see how :)
Anyway, congrats for making this game!