That was fun! The size changes have a good set of pros and cons to them, and the levels were readable and engaging.
The size change controls being based on key releases was a little unintuitive, but I got the hang of it.
Moving through the wind while small is a bit strange. It seems to preserve momentum in a way that mostly makes sense, but doesn't modify the player's actual speed when appropriate. For example, if you go down into a vertical shaft of wind that's blowing up, the wind will move the player as needed, but the player then starts falling at full speed upon leaving, even though they were being propelled upwards. It's a little tricky.
All-in-all, good work!
[EDIT: 8-20]: Also, the block destroying sound effect is a tiny bit too loud. It peaks the audio to -0.0 dB all by itself.