Main lead synth sounds to loud in the mix for me. Could be my headphones but I think they would benefit from being quietened down a bit and adding more reverb time to it (sound a bit clinical). As said the arrangment is pretty much repeated. Maybe some chime type sounds to vary it up would set it off a bit too.
Pretty much the same thing for the 2nd tune too. I would try and use a few different synth sounds for the main hook within a single track. Just gets a bit over done but I don't think they're far away from being good tunes imo.
3rd one, generally not for me until 4:50 and then it was like sit up straight and take notice, and then it ended - why do you not use that sound in the main part of the track its class??!!??