I have never played Fruit Ninja, but I know what the game is and this works similarly. Still, the game has many problems, both in performance and in entertainment.

Mechanic problems:
- As you stated in the comments, the hit boxes do not respond very well. Since the game is based primarily on the mechanic of slicing the fuzzy things (hitting the hit boxes), this problem interferes with and hinders the gameplay and annoys the player so this takes away from the fun that can be had playing it.
- The medals do not work for me and it would seem the last time they were working was 3 hours ago (according to the medal details).
- The achievement page has no description so I can only guess what each of the achievements are for.

Game entertainment flaws:
- I believe Fruit Ninja offered a combo bonus for taking out multiple fruits at once, but there are no bonuses in this one, just slicing (except for the killing the black fuzzy with a skill).
- There is no time limit or any limit whatsoever on the player. The fuzzes just keep popping up until the player kills enough to reach the next level. There's no challenge in this. If there was a timer or the player could only miss a certain amount then it would be different, but as it is now, anyone can advance to the last level given enough time.
- I do not understand why there should be a score chart if my score gets reset after each level. Is there an achievement I would get if I reach a certain score?

The music, however, was good and I can see why someone would play a game like this (a slicing game). This may just be my opinion, but the game seems kind of boring and repetitive and I don't want to gain a skill just to have to buy it again. I will commend you on the slicing animation for the fuzzes however. I hope you improve on the game and I hope you will continue to make game (please do not let my comment discourage you). Good luck.

o.O What happen with hit detection?
The game is very similar to Fruit Ninja. I think you thought on Fruit Ninja to make this game, though maybe you have never played Fruit Ninja and I'm wrong. I think this game is good to start learning, you have to improve the game very much. Many people told you to fix the hit detection and I think, you shouldn't have uploaded this game with that poor hit detection. Ok if you don't know how to make amazing things, I understand that you make things like this, but I think that if you make a game so simple like this one, it shouldn't have any error, if the bug was visual I could understand but the bug is on the main thing which this game has so I don't understand why you didn't realize of this giant bug. I don't know what to say about music, it's cool for me, though I like all songs from games.
By the way, those hairy monsters are so cute :3

Good concept but lacking in a couple areas.
No. 1
The background is bland and untasteful.
No. 2
The hit detection needs to be upgraded/ fixed. That error right there is probably what killed it for most people that played the game.
No. 3
Add unlockables in a game like this. Keep your players motivated to play or else its going to fall in ratings...

Hit detection is pure evil shit...

Hit detection is pretty bad. It's unclear which colors you can and can't hit. You can do better.