This is so clever! I really like the central mechanic forces the player to balance difficulty. It feels like it has the bones to be a speedrun game. I am so bad at platformers but I was also determined to finish the levels with as few blocks as possible to have the max time.
The resolution was weird on my laptop unfortunately so some of the screen was cut off. On one level, the buttons didn't show up and I had to force quit to go back to the menu. i do think with a bit more polish and this could be a brilliant experience.