I realize this is a work-in-progress, but so far I think the piece has some depictions of mania that are clear and some that are not. Speaking from my own experience, the dissonance and timbre of some of the instruments are overstimulating and some parts are disproportionately big and grand in atmosphere, much like mania. In that regard, It's quite accurate IMO.
I will say this: to me the tempo is a bit slow and even and the instrumentation is not chaotic enough for when I think of mania. I get that people have different experiences, so I'll give this piece the benefit of the doubt, but I think a bit more chaos and overall tension throughout the piece could really help make the concept you are trying to present show more clearly.
I hope you find this review helpful. :)
More info about how I review music here: https://codefreq.newgrounds.com/news/post/1089806