There's no other game that have the intricacy and replayability of gggb, but I can list a couple that in my opinion are totally worth playing and supporting:
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(the second in development right now): incredible high quality in all compartments and it's even fun to play. The first is a little linear, the second is going to be much bigger.
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: very nice and beautiful game. Recently I think the creator got even better both in designing the game (paths, dialogues) and in the art compartment
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: intricate gameplay and paths are difficult to discover, but the creator is incredibly invested and the game is fun to play
And here others I'm supporting but in my opinion not (yet) at the level of the first three:
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: I'm supporting him right now, but he's just starting out. Taking into consideration art, kinks and different paths it seems very promising
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: a lot of variety and paths and and an interesting and fearless approach (finally) to a kink like ntr or cheating. Interesting game mechanics too. Thumbs up.
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(almost finished) and Diminishing Perfect (newcomer): peculiar games and art (and kinks), but I think the creator is worth supporting
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from Wild Snowman: really high potential but the creator doesn't seem to have the time (and support) to keep going
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: beautiful (best textures hands down), but the creator have to get better at writing, especially the sex scenes
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: great potential here too, but let's see the next releases
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: worth mentioning and supporting
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: worth mentioning
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: worth mentioning
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: fantastic art, but who knows about the rest. Let's find out the next releases
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: really interesting, too bad the creator seems unable to continue
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: you see in my sig, huge potential but I'm not yet sure I can trust the creator to deliver (not supporting him anymore atm)