I like how you are using the instruments in a varied way, like the low piano being played at least in part for the slightly out-of-tune sound of the low piano notes.
Between 1:45 and 2:00 you are modulating to a different key and that felt kinda not needed at that point. The music was not overstaying its welcome, you did not repeat prominent earlier phrases in the new context... it felt like an exercise instead of what the piece called for. The music after 4:00 seems to have little to do with what came before it, other than the instrumentation, I think, a little more callback to the earlier sections would make it more reliably identifiable as part of the same piece.
Besides those minor gripes, I would love to hear something of yours played by an actual orchestra.