Really nice game, I love the idea and really like the visuals, the sounds are also really nice. I do also like the gameplay, but I have some issues with the bug entering being random and you needing a specific amount, that could just lead people to build a small web and then just wait. (Yes, I did realize, that there was a fail screen, but It was still pretty easy to just build these webs) Instead you could maybe have the players build their web, then submit it to test it against a (not random) wave of bugs where all (or at least most of them have to get caught). I also encountered a few bugs (okay, actually no pun intended here i just realized after writing this, that that could be a pun) at least in the web version the movement of the spider is a bit jittery at times and the pause menu is in the bottom left and I can barley read, what the buttons say. (But Bugs are pretty much a given, especially in jam games and especially in web exports)
That being said I really like the idea and the execution, especially the art looks really nice, I like how the mousepointer is a cobweb. I also think it is quite nice, that the amount of string you have left is based on how long your web is and not on how long you have been holding down space.