Hi, you are right, i'm very sorry, you are right. This version is a "rescue" after our backend went offline and not properly tested, so this buggy level went unnoticed. If you still had fun: I'll release a much better version with new animals and a big campaign map with 100 levels in January as a full game. I'd like to give you a free key to make up for this annoyance, just send me an e-mail.
btw, the original solution here was to put the mouse in front of the stone so it cannot move out of the way for the rabbit, if the rabbit sits left of the bush. But the mouse cannot be caught afterwards, due to bugginess. This would be the right version of the level: