I think it's the angle that's bothering me. I'm not used to moving like that on an isometric field. Again it might just be me because the horizontal and verticle directions feel strange to input with my keyboard. Possibly slowing down the movement speed could help with this?
It also could be a visual thing with the test area. I can't pinpoint what is bothering me but that's the best I can describe. I will say it is a VERY cool idea! Sorry, I don't mean any of this as negative just some helpful criticism. (sometimes in jams people take it to heart, I even have myself). I hope this helps!