Thanks for the detailed feedback! All those "polish" aspects you mention weren't there for the first Global Game Jam version of the game (made in 48 hours) - I spent the OGA jam period adding all the polish, and playtesting and tweaking game play. Although the concept is unchanged, I think it makes quite a difference.
You're right that you only need to survive for two nights now, though there are some later maps where it's still three... But I should probably change the text.