I was unclear on what genre and mechanic you were attempting to create. But, you used shapes effectively to convey abstract objects. Red bad, purple Pogo Stick; all easily understood from a quick glance. Enemies were a bit inconsistent sometimes though. My immediate instinct was to jump on their heads, but sometimes they would disappear, and other times they'd end up hurting me. Anyway, all n' all... Not Bad. 

4/5 for the general idea... The execution could be better with fx and more responsive controls but I really liked it...