My friend and I want to do this jam, and had a question.

We've already written a basic, super bare-bones engine we'd like to use as a base. It handles collision, and storing/loading tile-based screens based on a given "map x" and "map y" position. It also handles dialogue text, and save file data. We've used it in a couple other projects already.

Would this be allowed? It's not a super major thing, but it's still somewhat significant, also has been made before the jam started, so that's why we're unsure. Thank you in advance.