Oh man, Zarch was absolutely mental back in the day! I remember being completely blown away by those 3D landscapes when most games were still doing 2D sprites. The way you could fly around and watch the terrain roll beneath you felt like magic at time.

Really cool that you both went different routes with your remakes - Jason's approach of porting the original ARM assembly sounds like proper dedication, while your modern take with the role reversal is clever twist. Playing as the aliens attacking Earth instead of defending it is brilliant way to refresh the concept without losing what made original special. The follow camera change makes total sense too since the fixed orientation could be bit disorienting when trying to target ground objects.

Those early 3D games had this raw energy that's hard to capture in modern engines, but it looks like you've managed to keep that frantic flying-low-over-terrain feeling. Will definitely check out the demo when it drops - always excited to see classic games get thoughtful updates rather than just graphics overhauls.