Nice concept of healing other happiness while you have to keep watching your own health :)
You can add more potential stuffs to this game with something like:
- Happiness reduction over per x second
- Some people need a number of shoot to be happy, example: 3 shoots to make a certain person happy
- Healer check point needs time to be reusable, to make it even less abuseable
Also, the wise cat looks like a puppy :D.