Hello,
iv come to that forum while looking for a game i'v played few years ago, so i decided to give it try.
it was 1st or 3th person shooter, i belive from 2000-2005 or so. it was quite minimalistic and the game was small to download, 200or so mb. it was arena type of shooter, there was no plot or story i can remember. u played as robot vs other robots, they looked kinda like that one:
https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcSABFoB5ZpUJgiBvb8aI8N7j0IbW0A_uL7K04ibOH1l8itUU8NE
there was some kind of exp in battle, you got points for frags and could spend them to up some of ur abbilities.
map design was simplistic, they were mostly white, all of them open, hanging in space, some based on mobius ribbon idea, or simmilar. there was weird gravity, kinda like in space, there was no up/dawn, you could run on walls as well on cellings....
iv belived it was q2 or unreal 1 engine, but iv checked games based on those and found nothing.
im positive its not on english wiki fps games list.
i belive it was indie studio, it wasn't any big production for sure. it may have been some open source project, but im not sure about that.
if that rings a bell, please let me know what was it called