Thanks for playing, and im sorry there wasnt any instructions xD. Basically, the goal of the game is to get as much money as possible through the cats by hitting pegs (The red ones are inactive, and the yellow ones are active) and increasing money multipliers, while making sure your all of your cats don't lose their nine lives and you get a game over.
The red hole doesnt increase the cat's multiplier, and the green hole increases by one. The score can be increased by either hitting pegs, or a passive bonus based on how much money you currently have. Each cat has its own type, which influences its behaviour in some way (I wont say how!) and stats to determine how good it is at hitting pegs. The cats have different colours just to differentiate them when looking in the stats screen. I hope this was a good enough description until i write something up properly, have fun! :)