Pretty basic but do it's job. Kinda dislike the first level because you better stay close to the right of the window in order to get the big jump quickly. Second level is better designed. Third is ininteresting. Fourth is good (didn't see after).
Gameplay wise it's ok, character responds well, little acceleration/deceleration, air control, pushing you to estimate your jumps but not completely unforgiving
It's lacking a little music maybe, concept maybe a bit overdone, but overall fine. Keep doing the good job !