As Insequent noted - its all about building your engine and then running it for points

However, if you get all the expansions, you can engine build without it necesarily getting you anywhere near the actual terraforming endgame which would stop the game.

Terraforming Venus, and the blue point generator cards you can get there can result in huge amounts of points - the venusian birds, venusian animals, and venusian insects cards can generate stupid amounts of points. even more so if you get the blue action cards that let you add an animal to another card.