I appreciate very much the fact that you developed a working online multiplayer game, unfortunately, even if I like the genre, it lacks of many features that make the game interesting.
It's hard to understand how to deploy the units and how do they spawn. Also, the game has only one objective that give no much options for strategy.
Definitely a game you can aim to develop much further. To make a nice strategy game it takes time, and trying it during a jam was ambitious, but a great exercise for you.
For the jam it's also hard to test, since playing with another person is usually difficult.
Nice try, keep working on it, you might get a nice game out of it if you persevere :-)