So, my review - I loved it, great level!
Issues:
Of course, the main issue is the single save point experiment. Such experiment did work on plural's Hypnagogia if you ask me, but not on this level. Randomness-based creatures everywhere are incompatible with such a saving style. In general, it's hard to pull off.
An issue with fiery's instructions when going through the clouds. "Jump left and climb" instructions would often fail: on x1011y990 there shouldn't be a sign area at x4y8, on x1012y990 there's wrong sign area at x16y6.
I've attached 2 wallswim screenshots.