I think the art looks really good and this is a fun idea. Wish the attack hitbox was a little bigger. Still had fun and enjoyed it, great job!

Using the up arrow key to jump isn't the best idea—it's not very ergonomic or comfortable for the hand and quickly causes fatigue.
The attack animation range and it's hitbox should be increased, it's a bit tedious to literally walk up to an enemy and stab them with a tiny knife...
And yeah, he number of hits required to kill a bare is too big. One or two hits are more than enough.

The sprites themselves are not bad. 

Keep up the good work and I wish you success and good luck in your future projects!

It's a cool idea, the music gives me the exact feeling of the game

The sprites of the enemies and the Easter bunny itself are so good!