It was a a fun game, I enjoyed playing it, but the shooting was kinda hard to play with, since only pressing space would move your character forward, making it so that you'd have to shoot before looking at an enemy to hit it. Though, when holding space it was easier than it seemed at first. Either way really fun game and can't wait to see what new projects you have :)
I'm guessing you're referring to when enemies start moving faster, and thus making it harder to react?
Either way, thanks for checking out the game. I wanted to make something simple, where you would only need to use a single button, making it perfect for a mobile port, if I end up adding upgrades and such to it.