Thanks so much for giving me your feedback!
I had the shed specifically collect the leaves by itself on purpose. I felt like there would be no need to put leaves in the shed if they fell there!
I agree about the dark.. given a little more time I would have added maybe some lamps on the shed or something to give a little light at night. I did want it to get that dark though, but it would be nice to be able to see your character at least.
The speed power ups stack on the bottom left of your screen. They reset at the start of each new level.
I noticed that about the level number, also at the beginning of the game it doesn't show how many leaves you need until you place some in the shed... a couple little ui issues to deal with.
All in all I was happy with how it came out.
Thanks again for the lengthy review!