You too?
Honestly, I don't hear it. Each song sounds completely different to me. Six of the seven songs are in the same key, so maybe that's the similarity that you hear. No worries though, Track 8's gonna be in the key of E, so it'll be different than all of them in that sense. Also, you're only hearing 30 second previews, and not the whole songs, so one 30 second segment may sound like another, while the entire songs are completely different. Finally, I may note that all composers have their own unique "style" of a particular type of music. Obviously, my songs all follow that style, but typically only in instrument choice; something that I mixed up a bit with Tracks 1, 4, 6, and 7.
Still each song sounds very different to me, and it may be because I composed it, and know all the intricacies and details of each.
Argy