This seems like a great start.
Th marking mechanic is neat, and makes it feel like a slightly more freeform take on Papers Please's style of interaction.
I enjoyed what I played so far, but I couldn't find any interactions to do after the first marking puzzle. If that's all there is, then that's fine - that's how game jams go sometimes. If I've overlooked something, let me know, because I'd love to play more!