You worked on the visuals like you said.
I really liked it too.
The music was also cool and it kept me going.
Add in more levels maybe ?
Can you try animating the eyes on the block, like the eyes follow the mouse when you move it around ?
If you could do that it would be way more cooler!

Stick to a particular theme like choose a scenery or make your own, so it would look better instead of choosing some plain old image for your Background.

Also the duck hat, Commended !
Maybe add in more bonus hats.

I suggest you make a holiday themed game, since Christmas is almost there !
Like a snowy background and a Santa hat as a reward!
Don't forget the Holiday music too :D

Well done and Good Luck !