 If you liked
Overman King Gainer
|
 ...then you might like
Bounen no Xamdou
|
Wacky, Wild, Biopunk, futuristic, and mecha. Definitely similar.
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Recommended by AnimusNathan
Both series have similar aesthetics courtesy of character designs by Kenichi Yoshida. And either series is mecha with elements of biopunk - particularly in Xam'd, which isn't tagged as mecha.
The key difference lies in the tone/mood. Overman King Gainer is upbeat and fast-paced, while Xam'd: Lost Memories takes a more somber approach. In either case, the setting and details take a while to be fully fleshed out.
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Recommended by Quetzal_dactylus