Track 1- I really love the piano but not so much when you come in at 1 min with the buzzy synth. I like the beats and elements at 1:50 just not the buzz as much. I think it takes away from your melody. Your melody at the start kind of has a M83 feel to it. I love M83!
Track 2- I think this would work better if there was more variety in the sounds. They all sound the same.
Track 3- This has a video game sound, cool! Could use a little softening.
Track 4- Like the beginning rhythm...not the buzz
I really love the piano in the first track and I think your tracks could benefit from some softer elements. You seem to favor that buzz sound.
Good job though you came up with some unique and different sounds.