I should have posted yesterday when I played it, but better late than never.
Its a really impressive first release, I had a lot of fun, but Im not all that familiar with the process of demoing so I think this one might end after I stupidly jumped backwards over lava, still, hope it helps.
I have to agree about the end part, it took me a bit to figure out the invisible wall, and Im not a big fan of trial and error switches, but besides that I really have nothing bad to say.
Here's the demo:
https://ufile.io/f3qht