Really nice demo with levels that explores differents ideas . I like the controls, very simple and responsive, and the animation with the weight of the character works very well. My favorites levels are the Clean Up 2 and Survival 3. I wish you have put some items that recoveries health though, it would make the exploration in clean up levels more rewarding I believe, and I'm not sure about the bullets having a limit, I don't see how this would work in a finished game, because the shooting range is already very short you know? I think if the range was bigger, I'd understand the limit, but of course in a finished game this could be balanced through upgrades/power ups. I hope you keep working on it coz I see a lot of potential for a finished game since this demo you could make different situations with few elements and it was very fun to play. Nice work!!