Very good-looking, especially for a game made for 3-day game jam! Pleasant, consistent graphics, nice music, simple, yet well-executed idea.
A single thing that kinda annoyed me was the slow pace - I would love to see some kind of "Boost Up" mechanic.
Still, this is just a minor setback, a suggestion I may say. Keep going with the good work ;)
~Krystian, Ecstatic