Games You Could Make With This :D

These are some sample ideas, but as long as you're thinking 2d you can probably pull it off. Even a 3d game that relies on the 2d physics would work too.

Deathmatch or Battle Royale

The demo shows you can make a deathmatch and the ghost manager means we can technically run the game with 100 or even more players.

Co-op Story

Using a similar approach to the demo, you could pretty easily make an old skool Zelda style game you can play with friends. You could even build a roguelike such as Nuclear Throne fairly easily from the starting demo project too.

Beat Em Up

Minor code tweaking to take out the 4 directions and change it to 2 and you have yourself a beat-em up you can play with friends!

Platformer

Using some solid detection code, you can work out where ground is, add some gravity and have a platformer up pretty quickly.

MMORPG

In theory you could do this. Main limitation is that the server is in the scene that it is in charge of. So if you went 1 scene big open world with a cap on player numbers at some threshold you could or if you got creative and worked out how to have multiple game servers running, managing different scenes of the world. You could do it