Correct.
So for this jam we are limiting it to physical games (tabletop RPGs, journaling games, worldbuilding prompt/generation games, letter writing games, and settings, rules supplements, etc. for all of those).
There are some great sources on cretaong your own with different free or open licenses (such as Caltrop Core, TAGS RPG, Wretched & Alone) if interested.
If this does well enough or gets enough traction we may do another ine in June and that one may be open to other games as submissions.