I played the game for a solid 5-10 minutes but I have to be honest and say, I have no idea what I was doing. Are you supposed to become something else than the rat? I didn't really understand the objective of the game (even though it was described in the beginning and in the pause menu)
Mate we commend you for sticking with us that long! Cheers dude.
If you bring the humans to despair (when the slider is empty), you can posses them too - but the majority of the game can be beaten as the rat. I threw up an almost rat only playthrough on the page if you'd like to flick through. 
We def agree that there could be muuuch improvement in terms of the tutorial & the game to player communication. However I'm sure you can tell by the state of the current info sources (the beginning & the pause menu) how rushed we were!