I like where this is going! I believe you got yourself a good canvas here. You have so many directions where you can head - like different sorts of surfaces where you either can't walk on or swing from; you can use the tongue mechanic to grab and pull stuff (e.g. pulling levers, coins, enemies, etc); you can have dexterity checks where you test the player's ability to leverage momentum to clear long jumps too.
I loved the art style and the presentation too. Please keep working on this!