Hi! Welcome to the Topdown Showdown community. Going to cover a couple broad topics that will probably be brought up as we launch.
Q: Online mode
A: Currently the online mode is based on one server. The population is likely going to be small, under 10 players average, but there are plans to purchase a new server and eventually let players host their own servers. Right now, however, Online Mode is going to be based on 1 community-focused server.
Q: Local multiplayer controllers
A: You can only currently configure the controls for player 1. It is recommended that as a result you use the same type of controller. Controller setup info in other thread.
Q: Game not closing in background
A: This is known, and it's being worked on. If this happens you can close it with task manager.
Q: Game doesn't launch
A: Install the directx in my documents/byond/bin to solve this. If there is no byond folder in my documents then allow topdown showdown.exe through your firewall so that it can put the folder there.
Q: Some graphics turn invisibile/masking after updating the game
A: Usually this is fixed by just restarting the game and not pressing F4(fullscreen)