It's a nice concept! a few notes.
I wish there were more indicators, first I don't know when the whistle will be available again, so I'm spamming E like crazy while being swarmed by enemies. Then the enemies when frozen I don't know when they will "unfreeze", a good idea is to make them flash, like packman's ghosts when they're about to become enemies again. Also when I freeze the enemies the whistle animation doesn't let me see anything, it's a cool animation but it's detrimental to the gameplay since I can't see where I'm going. The whole animation takes up one of the four seconds the freeze timer.
Despite those minor details that can easily be fixed, I really liked the "almost 1-bit" pixel art, with few colors, and the fact that the cat can walk on four legs (holding S ) is really cute, too bad it wasn't utilized in the game. Pretty good job!