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Great use of the concept. I like the juice all the way through and using the walking to navigate the menus is a great way to introduce the player to the tunnels. I like the art especially the arm coming out. Since it is pretty unforgiving maybe you could look at  having an extra menu item which returns them to the stage they were up to. This would let them progress through the game without redoing the start over and over while also letting you do an iron man run to show your mastery. Great effort for a game jam though, I think you have a good enough base that you can extend it :)