Very gorgeous art, and very weird setting! :D I also really liked the jokes in some item descriptions, "this backpack has another backpack inside it" being my favorite.
At a gameplay level, I get the idea about having a limited inventory, but since you have no risks to avoid when moving from one place to another it seems just busywork to carry stuff around.
The controls are very good, moving Rumbo through tunnels feels very intuitive. Cool submission!