This is a nice little game. The game loop is really satisfying and makes you want to play 'just one more day'. The upgrades work well (although I think upgrading the food can sometimes be less cost efficiant?). I loved the plant that kept getting knocked over!
During the days there wasn't much to do though. I just placed a food item, a litter box and a bed (and later a toy) and put my cursor over the "accept"-button and clicked it every time a new cat came. When the food or litter box dissapeared I put in a new one.