I love this source. I may have to take a shot at arranging it myself.
The main critique I have to offer is adding more to fatten out the sound. The texture feels so thin across the whole thing, and the same general harmonic structure is repeated over and over which can make it fatiguing to listen to. The key change around 3:50 helps that a bit, but you definitely needs more mids represented in the overall soundscape, and maybe a stronger bass line.