Princess Loves Slime

The princess has been missing for weeks, and every hero sent after her has been turned back by the cave trolls guarding whatever's left of her. You're not one of those heroes. You're a slime, the kind adventurers usually kick aside on their way to bigger things, and you've decided you're done with that job.

Tired of harassing newbie adventurers for a living, this particular slime sets out to do what armored knights couldn't: get past the trolls and bring the princess home.

The trick is size. Absorb loose bits of slime scattered through the caves and you bulk up, but every time you use your slime abilities to fight or solve your way through a room, you shrink back down. That push and pull between growing big enough to matter and spending yourself thin runs through the platforming, the puzzles, and the trolls standing between you and the princess.