Short but sweet. The time limit on the last level almost made me ragequit, but I managed to make it to the end!
I liked the retro graphics, and overall retro feel. What would add to it even more is maybe some background music.
One thing I would change- sometimes it was hard to tell if the object can be jumped on, or is it slightly in the background. It wasn't much of a problem though. The time limits in the early levels were forgiving, and in the last level this wasn't a problem.
Over all- pretty cool, classic platformer!