Re
Very cool long intro into the first section. I also like that melody in the latter part of the piece
Overall there's quite a bit of mid to lower frequencies in this track that make the mix a little muddy - reducing some of those and maybe increasing some higher frequencies could help add some clarity in this piece.
Cu
Good use of interesting sound effects throughout, although some of them might be a little loud especially in the first ~ 50 seconds. It might be worth lowering their volume, as they overpower the melody at times. Drums have a very cool rhythm going on and the bass compliments it nicely. It sounds like there's a little too much distortion on the kick drum that I'd probably reduce slightly, but that's more my personal taste.
Ra
I like the harmony in the intro a lot, and the out of time feel with the keys is a cool effect. Personally I'd want to adjust the balance between the instruments because the cymbals feel like they're too loud while everything else is a bit quiet.
Overall, very neat ideas that I think could be even better if some small changes were made in the mix. Thanks for sharing your music, and keep up the good work :)