Hey, sorry it took me so long to get back to you on this one! I've had a rough week and just haven't had the necessary time to do my workshop mod duties like normal
Anyway, I'll have to echo the issues that Theophany and others brought up. This one takes a long time going places and overall the song feels very static. There's not a lot changing around, all of your instruments and synths remain in the same frequency range throughout most of the song with a few exceptions. To your credit though, your pads and ambient effects do help fill out the soundscape a lot, and there's a couple of verses that sound like you did a better job of filling out the space.
I would recommend changing up the instruments you've got playing the main melody line though - the piano sample that you've got would fare better as a supporting instrument because it's just not a strong enough sample to carry the song on its own. Search around for a while or mess with some synth creator programs to see what you could come up with, I bet you'd be surprised at what you can find with minimal effort Having some different sounds pop in from time to time would really improve this mix. Either that, or try and find a more expressive, higher-quality piano sample, perhaps?
I'm personally not feeling the acoustic bass, I'd like to see what you could do with a more electronic-sounding bass instrment, it might mesh with the rest of your instruments better.
I'd like to hear an update on this before I critique it further - you've got a wonderful source tune and some nice effects going for you, but this needs some work to make it more dynamic, less repetitive, and ultimately bring it up to the bar it deserves to be at Keep at it!