The menu is very bare bones, and there is no sound effects or music, which most probably are both due to the lack of time. It's impressive that you have multiplayer, though I wasn't able to test it. Some of the feathers really blend in with the background, I'm not sure if it tells you if you counted correct, I always count 12 feathers in the first difficulty, and it doesn't say if I got it right or wrong. Also, when the feathers are gone, and you submitted the time, you are just stuck in that screen, manually having to open the menu again, it'd be better if there was a screen that told you if you got it right or wrong, that also had a way to get back to the menu.
Competitive counter was even more confusing. It just shows 100, and if I press 5 a bunch it reaches 0. My best guess is that it's meant as being turn based for 2 people, and whoever actually reaches 0 either wins or loses, though wins makes more sense I guess.
For that minigame the menu button is completely broken, so you have to reload the page.
Don't have a quit button on web games, they just break the game when you press them.
The leaves look nice, and the way they sway left and right is good.