Yeah it's not really evil, but I just don't have a better word for it right now. It just had things that I would not really expect most games to do (checking my my personal notes right now, there I simply used depth instead). You did absolutely manage to give it proper longevity.
The destructible walls being marked by no crystals does make sense now. But a little hard to miss... Though that just reminds me of Environmental Station Alpha again.
My first instinct from the deep pit you gotta climb out of was that the Jump Jets do indeed refill after wallclimbing. But when I tried using that it just didn't work because I tried to do the same as I do in Celeste which here eats the Jump Jets (that sounds funny). So I just worked around it with my platforming skills to get out the pit.
Also I only afterwards noticed that this was for a 1K Byte jam. So also congrats on managing to condense all this down to 1021 Bytes.