Good game
Your game is a pretty awesome game.
Though things you should take into mind are:
Make diffrent enemies after a time it got boring to look at the same stuff the whole time. A good thing whas you changed the music when going into special mode. I miss the special colours in the special mode though.
And lately I find myself seeking games where you can accomplish stuff.
Find new things etc. So you may wanna try to make a game in which you can upgrade your player or some kind of stuff. Thats because we humans are made that way that we want to accomplish stuff. One of the main things that kept me from stopping where the levels I went up. Also a good thing I miss in alot of games are the way the hardness increases. You did a great job increasing it.
I hope to see more of you.
9/10