Overall I think the 2 different styles of the OST is a good idea, but I'd say they haven't been blend together enough. It rather felt like 2 different OSTs or different tracks when the styles were changing. I also had a bit of trouble imagining the story you wanted to convey through these 2 tracks. I'd say a solution for that would be that particular things you want to convey should hold a more distinct melody (and easily noticeable), or a more distinct sound. Then you can develop this melody or sound to represent the progress of your story.
Congrats anyway for finishing the jam !