Oh, did I already count that one?
Very nice little puzzle of counting moving and hiding objects! I enjoyed it a lot, and would love to play more.
Good choice of sounds and music, and very nice job putting all those cat sprites in the environment.
Thank you for incrementing the counter by left mouse click, that is incredibly convenient! Maybe adding a button to finish would also help (when getting used to controls I found myself just waiting most of the time).
The most challenging part was to see those cats due to their very small size of a bunch of pixels. The game screen does not take the whole HTML canvas, and the playing area is even smaller, so I had to zoom in 200% (not sure if that was cheating :3)