A neat looking, simple multiplayer game. Often simple games are good for multiplayer, because everyone learns them quickly and typical gaming skills matter less. I liked the movable objects on the play area that you can use to create obstacles. Of course, it could be nice to have sounds, but it's understandable keeping in mind the limited time of development.
If you're interested, you're welcome to enter our Game Development World Championship! We have a category just for jam entries.