I think it would be cool that if a game you create gets really good ratings and is selling for a while that you have the ability to create expansion packs for the game to keep it on the market for a longer time. Just an idea. 
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Thanks for the idea!
Expansion Packs are already an existing feature in Game Dev Tycoon. You’re able to make expansion pack for MMO games which you will unlock later on in the game. I would like to see this feature for the normal games too… not immediately in the garage but in the second/third office for example. 