Nice and simple, but addicting! Love how easy it is to get into, and the gameplay feels nice and rewarding, though it could use some variation to add difficulty other than simply speeding up, as that leads to a very strict score ceiling, at least for me.
Speed up! Speed up! Speed up! Speed up! Speed up! Speed up! Speed up! Speed up! Speed up! Speed up! Speed up! Speed up! Speed up! Speed up! Speed up!