I'm pretty sure some are nervous or do not know what to do with text-based since its not something you could see always in a gamejam so this are ideas

you can make a fighting game but the commands are by typing the attacks like attack or move left or something

and you can also make a physics game using letters or just make a platformer but using text as the characters

or a spelling game but add a twist

everything is okay just put a twist use your imagination prove your worth :)