Can I finish Act 1 side quests after....? [SPOILERS]

[nitrometano]

So... Alright. I finished Act 1 and it's okay and good.

But... I had some side quests to do. Is it still possible to go back and help the Nevrons I left behind? I know in the future I can backtrack to get items, but are those side quests lost forever?

[Meewec]

esquie can pretty much swim anywhere and there's bridges that allow you to go back over terrain in places, plus act 3 esquie gains the ability to fly. i think the only way the white nevrons are lost is if you attack them.

[WZ]

AFAIK the only side quest you can lose is the one to bring a blue mushroom from Esquie's cave to a little gestral in the village who's building / testing sakapatates. Everything else can do bone act 2 + no worries. Of course if you murder white nevrons you can no longer interact with them.