Unique
I must say, a game like this doesn't come too often. Very original and unique. I like how you took advantage of the average human psychology of using the keyboard and twisted it by inverting the key controls, that made it a tad harder to play.
I also liked how you implemented all these different effects like Low Friction and Inverted Controls to make the game more challenging instead of using levels. The music kept pumping you with energy and you really had to concentrate to make sure you were pressing the right keys for the right dot. Good brain-workout.
In conclusion, great concept you have here, I really liked it, good work!