Love to see people doing awesome things with FM8! The jumpy/plucky synth at the beginning is really nice, very full of energy gets the song off to a great start. So many of the sounds are great actually, it sounds like you switch between two different snare drums and I like one of them a lot, its nice and crunchy. The "GO" at 0:28 obviously is killer. I lovvve what almost sounds like birds chirping at 1:34. Did you make that in fm8? The lead instrument at 2:40 also very smooth. I mean you use that reverby violin sound all throughout the song but for some reason to me it sounds especially nice at that moment.
I can't comment on the mix too much cause I'm listening this on crappy laptop speakers, but it seems you make full use of frequency range and the mix sounds not too muddy and things seem quite clear overall.
I would say the melodies and chords are just a touch generic. But again, I think you make up for that a lot with how interesting your sounds are.
I almost feel this could be in the background for an endless runner type game? It just seems like less of something that demands your attention and more like something that could be in the background of a movie or a game. Thats probably due to the repetitive nature of the song.
Overall I really like it. I'm glad you decided to spend time polishing the song, it definitely showed through.