Yeah, the guitar sounds like it has no round robins at all. Each part with multiple repeated notes in a row sounds as if it's retriggered. In other words, the phase of the sound resets on every note on the same velocity. It's not necessarily off-putting, but yeah, it's fake and not sufficient for a remix with so many organic instruments playing. Same thing as above with the e. piano and piano. Since their velocity ranges are rather small (all three instruments), there is very little variation in their tonal hardness and character, which heightens the stiffness. However, the piano is substantially quieter than other instruments in the beginning, so it's not as big of a deal to me at that part. At 1:30, it's more of an issue though since it's more exposed, and at 1:48 the fast notes reveal its stiffness the most. Good news is that there is thankfully some reverb to hide the stiffness a little.
The bongo work is interesting, though a little loud, especially that last hit at 1:04. The strings aren't bad, as they were sequenced within the confines of what you had on hand.
For some reason, at 1:49 - 2:10 things are quite indistinct. I can very barely tell what notes are being played or what harmonies are being made. I guess the volumes are very close to each other and frequencies in the upper mids are overlapping; as you go more to the edges (far left/right) of the frequency spectrum, it's harder to hear frequencies clashing, but if enough of them are, then clarity is an issue. Right now, things don't sound muddy there, but they are also not clear enough.