This is beautiful! I really like the subtle metallic gloss on the body~ If working in blender, magickavoxel or qubicle, you should look into using emissives for the eyes-- it can help you get that glowing look used by the in-game enemies! :3
Why do robots have such long arms? (if they would be 1 voxel shorter they would be kinda proportional)Was it already in concept or is it because of needed sword hit range?
I have absolutely no idea for what reason the arms are so long. :3 I would imagine it was predominantly a design choice, but it may also indeed help with sword range!