Soaked in Sin is a anthology of 3 games:

The first game is a collection of minigames.
Use the mouse for all the minigames.
Each game will tell you how to play in the bottom left corner.

The second game is a first person shooter with multiple bullet types.
Use your left and right mouse button to create different bullets. 
Run around with WASD and shift to dash and space to jump.

The third game is a 3d platformer with the goal to clean up all the trash as fast as possible.
Use either mouse button to pick up a trash bag and items
Run around with WASD and ctrl to use the broom and space to jump.