Congrats on finishing! :D
Yes, those are intentional. I'll add a fade screen, so it's not that jarring though.
No currently there's only one ending. I'll add some more endings in the extended version, but the current ending can be considered the "true ending". I was going through a rather difficult period during the IGMC, which is why the true ending feels like a bad ending. I can explain it more if you want, but I'd rather do that in PM.