Milfy City, FILF and Man of the House, some of the best free roam games out there (imo). Having free roam in a game adds a huge level of complexity to the work that has to be put in, in order to make it fun for us. Being a DIK is a great game (can't wait for the next update), while it might surpass Summertime Saga in terms of quality, from what I've seen so far, I don't think it will in terms of quantity.
Man of the house is the only game I can think of that comes close in terms of quantity, and quality. But it's been in development for almost two years now, and it too went through a revamp of its core code, not too long ago, in order to better cope with the complexity of the game. Granted, it wasn't as long, but they're different beasts and unless you know the inner workings you can't judge so flippantly.