lol... I remember doing this in Metroid II after getting the Spider Ball, and it's the same thing here... At some point, the screen just stops scrolling and it doesn't let you go any higher up the cliff.
The cliff on the left side of Samus's gunship, however, you CAN go up onto. It leads to a big gorge where you can go down in between the cliffs... and there's a bunch of other paths here that I can't get through yet. I immediately recognized that unbreakable spike wall as the exit that you come out of at the end of the original Metroid II.
Finishing up Area 1
I tried that ice beam platforming puzzle again, and was able to get through it this time with some good timing. It wasn't until a bit later that I realized you can freeze enemies for a longer period of time with a charged ice beam shot.
Back to the purple zone to drain the water and go down further into the next area... I think I get it now... this purple area is like, the central part of the underground labyrinth, where all of the Metroid gates that lower the purple water are, and where all of the elevators leading down to the next area are... Then there are the big Area-specific non-purple zones, where the Metroids are at. Maybe the purple water is actually hazardous to the Metroids as well? I'm not quite sure... Hopefully this game will add a bit of additional lore to explain the purple water and why it's there.
Just starting Area 2
I barely got very far at all here, before getting stuck and giving up for now... All these slippery walls that hinder your progress... I feel like I'm gonna need Space Jump to progress here or something. Hopefully I'll figure it out without using Scan Pulse.