I'm using Photon PUN, the only proprietary server used for the game is the authentication server. The game "server" is mainly used by the game just a relay for the clients to communicate with the host.
It's possible to make your own Photon PUN "server" / subscription (the free tier is 20 users at once), but I didn't expose a way to change out the server ID that the game tries to connect to. I'll consider adding a way to change that in some config in the next update, but at the same time, this spike in players isn't going to last forever. In about a week it'll be easier to get in.
Considering it doesn't exist, no, they cannot. lol
I'm fine with people not liking something, but just spreading misinformation and targeting other people that play the game is cringe. So they've been banned.
If it's saying that it could not be opened because "Apple cannot check it for malicious software", right click and hit open instead of double clicking.
The [C] maps are indeed custom, but there's no easy way to load new maps in without creating a modded fork on github and adding them there, or joining the discord (https://discord.gg/dgKVaUKpj5) and submitting a design, usually created in Tiled
There's talks about allowing a custom way to play maps, but no work has been started on it yet.
If you want to contribute, just join the discord server and ask how you can help out! the entire project is open source, I have no problems with anyone helping out!
Local co-op currently isn't easily implementable. I'll put it on the list, but it might not be added for a while. I've just built a WebGL version though, it should make it easier to play with more people since they can do it right in browser!
