The first one sounds a bit happy, but it aslo carries some kind of disease that makes your head go from the left to the right, hahaha! I like it.

The second one is a bit more cheesier than that first one. Ad in more sounds, like several synth structures or sound FX!

The third one makes me think of the first one, without the happy-factor in it. The melody is very good, but I'd add in more drums and/or percussion!

U use reverb a lot, maybe you should leave it off on some of the drums. I'm especially interested in the first and last song, please continue!