Personally just sounds like a remixed version of a mashup between Rush E and Rush E 2, but slightly extended with slight internal loops. This is the third one that sounds like that in 10 minutes. At least rhis one is more original and actually remixs in slightly and extends it.
I love how people just copy and mix up pieces of previous Rushes E and never do their own parts, the only custom Rush E I know that isn't jsut a mixup is Rush E 3.5 Composition by Ekhyub.
The piano exploded AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA