Rendering is slightly off on the y-axis compared to the original game

[rozniak]

Quite a simple one - the scene is rendered slightly offset on the y-axis when compared to the original game. In the original, on the demo level, the floor is pretty much flush with the UI chrome aside from the isometric perspective of the sprite. In this ported version it's raised a bit.

I would suspect this is due to a discrepancy in how the coordinate system is handled - I think the original must use the bottom-left of sprites/the overall level as (0, 0), whereas of course in the ported version it's using the top-left for (0, 0). The offset is probably the height of the isometric portion of sprites (I think CellSize is the '2D' size of each object, not counting any isometric perspective on the objects when rendered in game).