This is really imaginative!
The piano and the flute at the beginning need to be EQed to better fit in the mix. Also try adding some reverb to the flute and the second piano (the one at around 0:40) cause they sound kinda barren as is. Maybe add some ambient noises at the section at 1:40, anything that touches around the high end, to tie that part over. If you're going for an orchestral theme, layering string instruments (or anything within their general spot in the audio spectrum) would be a good way to make this sound "fuller".
I really like the drop, though! Reminds me of Mura Masa - Lotus Eater. Only criticism is that there could maybe be a biiiit more in the high end department. Overall, I'd say that working on EQing your instruments and giving some of them varying levels of reverb will make this sound more ineresting.