Love the art style and the vfx - looks really well made!
One suggest for the trailer; Maybe consider shortening it by removing some of the repetitive sequences (e.g. making the jumps across the floating platforms, there seems to be a lot of that that looks identical - I think 3 instances of that in a row). Nearly 3 mins is pretty long, I think cut down to 60-90 seconds would have more impact if there weren't repetitive sections.... it kinda distracts from how lovely it looks.
But, that's just an opinion.