the experimental nature of your five tracks was great! you were able to establish distinct atmospheres that worked cohesively with the plot you had for your videogame concept, so nicely done! ^-^ it's nice to remember that motifs don't need to be the exact same in multiple pieces; variations in melodic and rhythmic structure as necessary are perfectly fine!
i do love how the tracks literally lead to the next one in the soundtrack!! i think it'd be cool to push the experimentation and energy shifts even more, perhaps with volume dynamics or ornamentations on some instrument melodies; but otherwise, the shifting of your instrumental palette serves to control the current mood quite well.