Very interesting concept. The only downer for me personally was that flies just appeared out of thin air. Wish they flew from the borders of the screen. But on the other hand it would loose a bit of its simplicity and accessibility this way I suppose.
I wonder if the web strings are made using some physics library ropes or chains or do you have a homebrew rope physics system of your own?
I can see that, bugs spawning via the z-axis sorta breaks the 2D plane everything else is aligned to, and can look weird.
I did write the physics code, but it's deceptively simple! Each strand is composed of a series nodes, each node tries to stay within a certain distance of the nodes its connected to. Add a lil' bit of gravity, some spring physics, and that's basically it! Mebs I'll do a a tutorial video on it...
