Lost Constellation follows Adina Astra's side-scrolling trek through a mystical stretch of woods, weaving light puzzles between quirky introductions and playful dialog. It's a standalone game rather than a demo or preview for Night In The Woods, and a tweet from the latter game's account states that Lost Constellation is "a lot like Night In The Woods and nothing like Night In The Woods at all."
A separate tweet suggests that comparable projects are planned, explaining that "NITW supplementals are weird, off-the-cuff, jammed out little games." Regardless of what's to come, Adina's journey lasts for roughly an hour and is available now at the price of your choosing. And don't worry about dampening Night In The Woods' surprises early – Lost Constellation is spoiler free.