The fact that the shadows can interact with the yellow flower put a nice spin on the concept. The levels were great at showing off the mechanic and I could definitely see those levels as some of the earlier levels in a whole game centered around this concept.
Minor criticism: the character looks about 1 tile high, but does not seem to fit through 1 tile high gaps.
Simple idea well executed.
I like the way teleportation and camera movement work. Quick resets and different music tracks make death less annoying (also it feels like you made a mistake when you die, instead of some bs, since the controls are so responsive).
I have already tried to get a better high score for the last 15~ minutes and will definitely come back to try again.