Glazewick

Glazewick is an ice-sliding puzzle. Your penguin cannot stop on ice: every move slides it until a rock, a snow tile or the edge halts it. Eat every fish on the floe to open the igloo, then slide into it. Snow tiles stop you dead, cracked ice turns to water after one crossing, pushable ice blocks slide on their own and can fill holes, and warp holes send you to their twin. 24 floes each have a par that is the proven minimum (breadth-first search), with stars for matching it, unlimited undo and restart. It plays in the browser with a keyboard, mouse or touch.