Very nice game with cute art! I like the game mechanic very much and some levels really were hard to solve (which is good!). Some suggestions:
-Restart button for every level to click on
-if the cat ghosts get captured maybe a cute meow sound would work nicely as well
- a little story around it - like a short intro or outro/ending would be great!
Tutorial is very nicely done and there is stuff which the player needs to figure out - I like that!
Gratz on your submission!