And a boss whose second form will probably be far too easy, and death of the player gets a unique cutscene, rather than the generic "You have died." message. Death in this case being caused by... walls.
Current progress with version 3: 33.3%. So many bugs to fix... including a game-breaking glitch or two (which is related to rockets). It seems a 3-HP run of the entire mod (up to that point) is possible, as well.