I have taken my sweet time to post this but I tested Alter Ego and Chase (probably not the most recent version though) and they absolutely rock.
Although the games lack a bit in the music and sound department, they are great to play and have solid controls, graphics and animation. Clearly a great effort!
I played them with a MegaDrive pad which was absolutely great for the job. I wished the games supported a pause button though.
At the moment I completely suck at them though so I will be training a bit. I surprised myself dreaming at the idea of having online high scores.
I cannot wait for the final releases and will gladly pay for them.