Thank you very much! The variety thing is something that’s been pointed out a lot in the comments, and I’m really glad it’s been called to my attention. It seems to be something I could work on in a lot of my music, although this one sort of had an excuse as it was my first major attempt at the synthwave genre.
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I would personally say System 42, which is my favourite.
But in general I found two things among the whole OST which made it feel little bit repetitive. First is that bassline stays on one tone most of the time in the songs. Unless it was a goal (which can be of course) I find it a little lacking - too stable to say. Second is that the sounds are more or less the same through the whole OST. For instance: you can induce more variety in one song by repeating the melody and harmony but giving the melody (or even harmony) to another instrument each time, thus making slight change in overall feel while not having to redesign the melody altogether.
But take my advices with a grain of salt, I am no music theory expert, nor teacher :)