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(1 edit) (+1)

But the rule says

  • 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 what resources were reused.

If I want to make a roguelike platformer, and I coded a non-roguelike platformer before.

Is it valid to use the previous game's code?

yes, pre-existing code is ok as stated by the rules. Just no code or art made *specifically* for your entry. 

(1 edit)

That seems pretty vague... is it OK if I sketched a bit of ASCII art for inspiration and concept development?

Yes, anything for inspiration and concept is good. Just think if you are working in actual Assets that will be included in the game,  these are meant to be done within the challenge timeframe.