Good game
Everyone else says the legs are slow. I have noticed that they just want to move a certain way. IN FACT the "random damage" is from a leg smashing into teh wall too fast. That can even kill in one hit (sadly, even when your about to finnish). As for "checkpoints", the levels ARE your checkpoints, as they are too small to have "check points" within them.
COMMONDRAGON'S TIPS:
1. move the legs in a half circle if they are being slow
2. To correctly attach the end of a web, let go of the web THEN let you may control another leg.
3. if you make a really long strand you can okace it in various spots., maybe the same to gather collecte items?
4. Make sure you don't hit the walls too hard, they hurt your spider as well as cause bolders to fall.
5. you don't have to web every green key, I in fact got the first one with no web (I just cornered it in the crack in the wall)