It was a fun game! The umbrella mechanic adds a nice sense of control over the high-speed falling. I was curious to see how long I could last, so I set a timer for myself! I don't have the best reflexes, so my highest time was 31.26 seconds, haha.
I found oooone small bug regarding a specific structure:
If the player releases the umbrella while they're touching the bottom-side of a block/tile, vertical movement is stopped, but horizontal movement is functional.