Reforcing what some had already said... The game is simply amazing! Graphs are cool, the music is sweet, animation is smooth... However, one thing really do bother... There is only ONE way to beat the game! The game forces you to find this only one path because the timer is too short.
You really could increase the timer or, at least, make the time "stop" when the "Animation" between levels is happening.
So, resuming, great game! Just don't make it insanely hard. Some people would like to be able to fail at least once and still win the game XD You could make a "Junior Mode" for the player to learn the levels! Without time!
Hope to see more. Carbo Diem.