Of course! The theme is more of a suggestion than a rule, simply intended to give creators a direction to go in if they so choose. Plus, it's hard to argue that language isn't also art, so go for it!
If submitted games refer to education or riddles but being textbased than drawn as comic/cartoon (art in general) or being based on voice, will those types being okay for submitting here too? btw: just noticed this one by browsing for a jam, "bit" late after it got created like a year ago & stunned that participants are still welcome.
