I think it's technically within the spirit of the jam - it's a chance for you to show your work off to the procjam community! You could always take Nikolaj's approach here, and renew it a bit this week, to celebrate the theme too https://itch.io/jam/procjam/topic/1094153/my-renewal-theme-is-renewing-my-2019-p...
Either way - I think it's okay!