I started with level 1 because it was the first on the list...died...and then went on to find the tutorial, which helped a lot of course ^^
The game's idea is nice, my main critique would be that on most (all?) levels it seems that you can get soft locked because there's not enough treats available to finish the level, but you're not dead either so you have to manually restart.
Overall it's a cute game, and the fact that you're playing a cat is always a bonus ;) Congratulations!