I liked the start, and how it went straight into the game. That first scene was nice too, I'd like to see more of what you could do with storytelling. For the controls, there were a few times where I was expected to do something, but I didn't realize at first, like moving down onto the level or pressing space to vacuum. I don't know if the guys walking around were supposed to be enemies, but if so I never really had to worry about them. I think the core game loop could use some more iteration, such as adding more obstacles to finding cows, etc. Overall what I'd recommend is just general polish and explaining controls.
I know a lot of things here are purely because of the time limit, and I'd like to see what this'll become once its finished :]