The musical style ended up with all sorts of influences. Vapor City by Machinedrum was probably the biggest one.
Ambient soundscapes aren't really my strong side, but I was forced to learn for this game. The result is reverb-drenched synths and grainy drum breaks layered with ambient loops. Turned out quite nice, despite being out of my comfort zone. Here is an early version of "Nocturne", which was meant to be the second stage theme...
...Although the main theme is just a solo piano track. I'll tell you a secret: it was mostly improvised.
The game was also meant to have a boss fight. At that point I couldn't resist, I had to put in some death metal riffs! Anyways, it's cut content, so you won't be able yet to... oops, I accidentally posted it.
As for the actual boss fight, we're looking forward to actually implementing it in the remake. I hope you look forward to it as well!
lapspider45