You can't just invent your own terminology.
actually , he can :)
It might be a bit much to call it an actual isometric engine, but it has an isometric view, granted not the prettiest (thats just graphics), but he has isometric jumping down on objects with heights differences .... if that doesnt resemble isometric ... lol, then Im a frisbee ...
Isometric view does not mean it has to have actual isometric tiling.
General isometric approach is an angluar top down view with characters and objects having aproximately a 57 degrees offfset in a top down viewing angle.
A platform like game, without the platform behaviours .... is still a platform game, right ?
Great job and nice of you to share :)