Decided to submit another game today.
Here's a demo of my Keen fangame in twine, Commander Keen: The War of The Tongies.
This demo game uses the 2 macros: <> (in the treasure chest part) and <> (the 1 second lava part)
The story goes: Keen gets his brother Jeem while the really evil characters named the Tongies goes to brainwash Jeem into a monster.