Imagine you have a buddy that you can do pretty much anything to even blowing him up with grenades or even throwing baseballs at him.
Toss Sausage Around Globe   Spank Monkey   Protect Fire   Virtual Police   Destroy The World   Morhun   Alpha Bravo Charlie   Insurance Hunter  
When you interact with him, you gain money (you get more money for more extreme actions). You can then use this money to buy new weapons and other methods of interaction. You can also buy new skins (so your buddy looks different) or new game modes (like Low Gravity, for example).
Use your MOUSE

Warp Forest To clear a stage, you must shoot odd looking trees in order to pick up special charges, so you can use them in killing animals and clear your way. Remember! The odd looking trees are limited in each level so, dont waste the special charges otherwise you will play the level again.