This was a really fun puzzle platformer! I think it is very approachable, unique (integrated the theme well!) and interesting enough to play till the end. The way new elements are introduced in each level is really fun. The core mechanic of the web is well implemented and although its easy to figure out, there were some levels where i had to think and plan ahead, which was great. I also liked that you could unlock new characters. The art was also well done and fit the theme well. I liked the sprites of all the characters! Probably would have liked a bit more polish on the snake like thing at the end, but other than that, good work!
The pacing of the game is great for a jam game - each level is short enough and the fact that you could add so many levels in such a short period of time is impressive!
One suggestion is that instead of the up arrow key, a space bar would have been more suitable and more comfortable for the spider web. and would have felt more intuitive especially if you have to shoot the web down. Its a small point, but still thought that i would point out.
Another suggestion would be to clearly mark an 'exit' for each level. For two specific levels i remember that i was confused as to where to exit (one was where the exit was to the top left). Just a simple exit sign would do the trick.
The music loop was a bit short so you probably could use a longer loop so that it does not feel repititive.
One thing i felt was missing and would add a lot to the feel of the game was some particle effects - things like when the web is shot, when the spider lands on a surface etc.
Overall though this was a great entry, really fun. Congrats :)