This is an unreleased game for the Gameboy called 'Death Track', with the alternative name of 'Trail Blazers'. Not sure which would have been chosen for the final name. Here's some footage and some info I dug up from contacting the developer.
Ah that's a shame. I didn't know anything had happened but thought it would be nice to have that higher-quality footage around.
Your commentary really adds something and I wish more people would properly present prototypes that way.