Even from just the demo, this looks like it's going to be a very good Metroidvania game.
I have a few points and questions though...
First, she wakes from cryosleep in just her underwear (understandable - you're going for a pretty standard sci-fi trope right there), but the fact that the first "upgrade" is a broken helmet before next getting a spacesuit with attached armcannon is kind of jarring as far as progression goes. I understand she'd be a bit disoriented after waking and her clothes might be inaccessible, but wouldn't it make more sense to find a jumpsuit/coveralls and a [laser]handgun first?
I dunno, that's just my opinion on aesthetics/progression and it may be far too late to even consider changes to the beginning, so take from it what you will.
I suddenly can't actually think of any other comments/critiques that haven't already been stated in the first page of comments I read (hitboxes and the like, mostly) so I'll just skip to questions.
1. How far progressed is the development? As in, have you finished the majority of the levels and just need to polish it so it doesn't break? Or is it more of a process of "get this section running smoothly before I start the next"? (I'm just curious about others' processes)
2. How long are you planning on making the game? Super Metroid is anywhere from ~3 hours to 8 hours, depending on skill. I'm currently paying La Mulana 2 and I'm already at 10+ hours.
3. Where do you plan on releasing it? If you release on Steam, will you put it up in Early Access?
3.a. How much are you planning to charge?
You can ignore #3 if it feels to early to say.
Thank you for taking the time to respond, I can't wait to see how the end product turns out.