You CAN use external libraries, game engines, pre-existing code/algorithms, pre-existing art, etc. You can even start your game from an existing game if you are planning to turn it into something unique. If in doubt, be clear about what resources were reused.

I’d like to pick back up my game from Global Game Jam for this jam. A lot of the core systems are built (in an extremely buggy state) and it’s not a roguelike… yet. I’d like to make it one.

• Give it procedural generation rather than authored content
• Give the game actual roguelike progression (run modifiers, upgrades, etc)
• (if time) Remake the art

I would clearly explain where the project was at before the jam in the description and in any submission text forms.

I’ll jam alongside yall either way but I was wondering if I should steer away from submitting a project. I don’t think I’ve ever done a jam in this way before so I wanted to double check.