Didnt see your reply until now (sorry) :C
What you could do is:
1. Post just one long level and that would cut off so much work.
2. (if gameplay is feeling like a boring walking simulator) you could make "keys" that when touched deletes itself and adds 1 to a keys counter; so when the spiders linecast hits a "door" the player can click and delete it which removes 1 from the key counter, that would make levels not a strait path and I highly recommend it. :D
Extremely sorry for the late reply :C