I had this game on an ST User disk around 1990 (ish) and all I remember of it is it was not quite a Boulderdash clone, but it looked just like Boulderdash, and played very similarly to it. There were toxic waste symbols, and also warps, and I would really like to try it out again. If anyone has the ST User disk image that it was on, I think there may have been a tree fractal generator on side B, but I can't remember.
I found this on YT, and this is the game, but does anyone know the ST User disk that this came from?
Sorry couldn't get YT tag to display inline so that's the link.