Neat little arcade game! I had fun placing the webs, and I loved the spidey sense. The sound worked well for it, though if you continue tinkering with it, I wonder if you could expand the game to do more (perhaps have enemies drop on your web instead of just losing web sections? you may have to spend web to defend your home - if that's already a feature, I didn't encounter it by Wave 10, so you may consider implementing it earlier).
Nice job!