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I like your first song. It especially sounds more like a song for an action platformer when you change the speed from 6 to 5.
Now, I know this is a first original, but you may want to take the same advice I took from the other guys up here (tadpole & nicetas_c, among others); volume is among the most important things to control in a song.
You see; all of your square wave channels are playing music at maximum volume. When they play at the same time, their volume actually builds on top of each other, amplifying the sound &, at times, drowning each channel out.
Choose a channel that is your lead & set the volume to play at a moderately high volume. Then, with your accompaniment, choose a channel that will be the main accompanying track & set its volume to something a bit lower. Then, play all other square waves a bit lower than the main accompaniment.
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