finally something new, different! Its this 2d or 2.5d?
I think this is 2D, because while 2.5D can have two-dimensional upright elements, the floor at least has to be actual 3D. But the ground here isn't 3D, it's all flat artwork. They've simulated depth of field and the multi-plane camera effect, but because no actual geometry shows up in the game's landscape, I think it's specifically 2D.