Isleward is a multiplayer roguelike currently in development by Big Bad Waffle. The game is based around forming a party and exploring different islands, spelunking and completing dungeons in search of treasure. Strengthening your character through looting better equipment and leveling up is also an integral part of the process!
The game is open-source, and the code and other assets can be found on the Gitlab. Thus, players can help spot bugs or even write mods to improve the game.
See the Game Updates page for the history of Isleward development.