Drums need a bit of work. The crashes and bass drums sound fine, but the high hats sound too synthetic. Taking the EQ and lowering the higher frequencies a bit should help. Also, the chord pattern's a little too... Repetitive. Fading out one lead instrument and fading in a new one with a different chord pattern would do wonders for this, but be sure to keep it the same key. My suggestion would be to have the square replaced by a saw later on, and have the square fade in a few octaves higher than it was even later in the song. Just a few pointers.