Nice one! As you might expect, I did cheat-save to get through it. I played it before the update and here are the issues I've spotted back then:
KS+ requires you to use Music for music and set it to loop in KS+ settings. Ambience doesn't get disabled when you disable music in game menu.
x1000y747 - getting stuck at x19y2 with no way, but Ctrl+R all the way back (it's clearly intentional and a clear mistake in design nonetheless).
x999y835 - You can end up misaligned and get stuck in "Jump here" portal.
x1000y850 - no ghost blocks as in x999y850.
x999y742 - reachable void.
Thanks for mentioning me! You've spelled my nickname with "e" instead of "a" in "Gray" :)