Charming little game. The realistic cat sound was a nice touch.
I died a little on the inside when I saw Alt was a control (I detailed on another game how my Window Manager gets overexcited when I press Alt and a direction and simulates a continually-pressed key). I desperately searched for an alternate binding, but grudgingly accepted my fate when I found there were none.
The jump is a little stiff, but otherwise seemed decent.
I didn't get particularly far, but it seemed the amount of cats was intentionally ludicrous.