I created this demo last summer.. Was an experiment I did with the Inviyya engine.
I always thought a much better game could have been made instead of the Ninja Spirit port we got..
[ Show youtube player ]
For an actual conversion this would need a triple buffer running or going down to 25 fps. You can see slowdown in the video when the objects (lent from Inviyya...
) appear.
But I think it would look actually quite good. Much better then the conversion we got.