No, it was not Ambermoon, not TrappedI/II, nothing mentioned above.
I dont know if it ever made it to a commercial product. But it was damn good and athmospheric. It was outdoor, a small smurfish like Village and a lake, and some 2D sprites. Moving was fullscreen and like in Doom. GFX went 2x2 when you moved, and rendered the missing pixels when you stopped to look 1x1. Thats the main technical feature I remember.
The name had something to do with "abandoned", IIRC, but I am not sure.