Eiyuu Gaiden Mozaicka

Both OVAs are short with simple, quasi-mythological fantasy plots. They both take place in compelling, dark fantasy worlds which are characters in and of themselves. The art in Lemnear is much better, but the world in Mozaika was more compelling. Both worth a watch if you like oldschool fantasy.  

both have a fantasy like dark ages genre setting, and both main villians are too lazy so their headquarters are mobile, in amon saga its a giant turtle with a castle on top, in mozaicka its a giant floating statue head with a castle on top, both heroe's are rectifying for the mistakes that their father or ancestor had to endure thanks to higher ranks, and both have a non white knight look despite their white hair. 

Incredibly weird medieval fantasy settings with a lot of odd sci-fi elements thrown in, sci-fantasy? Who knows. Throw in some mech's in Mozaicka and you could almost imagine these two series take place in the same universe. Both are handled by the same director and character designer as well, among other staff. Galient does benefit a bit more being longer for sure though, sadly Mozaicka tends to feel like a "what if teaser" of sorts, but it's worth checking out if you like Ryosuke Takahashi's stuff.  

Mozaicka is so incredibly obscure that I can't really think of specifics for this recommendation, but chances are if you enjoy Ryosuke Takahashi's early directed works like Votoms, Layzner, Dougram, etc, chances are you'll get some enjoyment out of Mozaicka since his usual style is definitely there.