Splitkick: When creating the sequel to a masterpiece, developers need to use great care in their alterations. Change too little and you’re at risk of having your sequel labeled a cash-in; change too much and fans may revolt. Take StarCraft II for example. While the engine has updated and there have been tons of improvements throughout, at its core the game is still considered a benchmark by which all other RTS titles can be measured. Blizzard does it right, but they take their time in doing so.
Trials HD was considered a masterpiece for its technical proficiency, addictive qualities, and pick-up-and-play nature. But instead of changing much with Trials Evolution, RedLynx decided to play it safe. They released more of what their fans loved while not improving the periphery in any meaningful way.