Glad to hear that the game is still being worked on! Those other projects you worked on may not have finalized into a full product but by no means does that mean the effort you put into them was wasted. Everything you learned working on them helps further your skills.
On Act 2 itself, it seems really ambitious and I love pretty much everything about it!
I don't know anything about programming but I would suggest making Act 2 it's own separate game instead of tying it directly to act 1. It just seems like it would make development easier instead of tying everything together. But like I said I don't know jack about programming so you do you.
Side note: Did Webby get a growth spurt or something? The new art makes it seem like she's as tall as Mira but the art already in the game makes her out to be about Selena's height.