I think the soundtrack is pretty good overall. One small criticism I have is that certain tracks like Track 3 and 7 sound way louder than the other tracks in the soundtrack. It kind of comes across as jarring when listening to the soundtrack as a whole.
If you would like some advice about how to get your mixes to sound equally loud, I would look into finding a loudness meter plugin. These plugins typically have a measurement called LUFS, which measures the relative loudness of the entire track. I don't think FL Studio has a loudness plugin built in, but I looked online and it seems there is a free one.
Video link for more information: https://www.youtube.com/watch?v=ANzd6xQDJRM