So, you have 7 moves to thwart an apocalypse. That's not much time, not enough to leave the building you are in. You explore the building for a very short while, learn something about the game world, then you die, and start anew; it resembles, for example, Rematch.
But, unlike Rematch, which is a parser game, Save the World in 7 Moves is choice-based. Therefore, you don't have to invent some complex and unobvious actions in order to win - all the options are explicitly given to you, and at first it seems that you can solve the puzzle by simple "lawnmowering": just go everywhere and try all the links - sooner or later you'll find the winning one, right?
Wrong. This game experiments with the choice-based format, uses a few rather unusual ways to conceal information from the player and makes you do things you rarely need to do in a Twine game.
Also, it's funny, light-hearted and somewhat absurdist.
I'd recommend (Spoiler - click to show)listening to The Song right after you finish playing.