Sweet platformer!
I liked that the game is easily grasped by the player, and then the speedrun begins. I challenged myself to finish most of the levels without a single death, and as fast as possible, it was fun! Visuals and the audio, in general, are good. Visuals teach the player what is good and what is bad gracefully, and the audio adds to it. The resolution restrictions seem to be not a problem for you too, you have worked on it professionally as I can see!
Well-done!