Progressive Worker Placement: Action spaces can be used multiple times, becoming more expensive in the process.
Two-Field Rotation System: Fields lose their potency over time so fallowing fields allows them to become increasingly effective.
Card Combos: You can play cards at any time; this timing—and the combination of cards—can be very powerful.
Sheep with an Expiration Date: Breeding sheep early comes with a lot of perks, but, eventually, sheep will die of natural causes.

—description from the back of the box

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Keyflower is a game for two to six players played over four rounds. Each round represents a season: spring, summer, autumn, and finally winter. Each player starts the game with a "home" tile and an initial team of eight workers, each of which is colored red, yellow, or blue. Workers of matching colors are used by the players to bid for tiles to add to their villages. Matching workers may alternatively be used to generate resources, skills and additional workers, not only from the player's own tiles, but also from the tiles in the other players' villages and from the new tiles being auctioned.

In spring, summer and autumn, more workers will arrive on board the Keyflower and her sister boats, with some of these workers possessing skills in the working of the key resources of iron, stone and wood. In each of these seasons, village tiles are set out at random for auction. In the winter no new workers arrive and the players select the village tiles for auction from those they received at the beginning of the game. Each winter village tile offers VPs for certain combinations of resources, skills and workers. The player whose village and workers generate the most VPs wins the game.

Keyflower presents players with many different challenges and each game will be different due to the mix of village tiles that appear in that particular gam

Amalfi: Renaissance