My legs are indeed ok.
I had really bad screen tearing until I turned on v-sync, an option for that ingame would be nice. Also invert mouse y-axis. I like the aesthetics but it can get very confusing what is a wall or not with all the overlapping lines, the second area was a lot better in that regard. But I didn't feel like there was much of a reward to going deeper into the caves compared to the danger of both hitting walls and the timer running out before you can get back. I mostly grinded the closest areas instead but quit before unlocking the 3rd, I think my eyes started to hurt hehe.