Thanks for the feedback and that's an astute observation. This is actually a result of converting from tick time of the original to physics time of unity. It's a pretty wild side effect but basically it causes all distances to actually increase by 10x even though kps is THE SAME. it's a little mind bending. Relative speeds are indeed the same, but it causes a ripple effect of interesting things like you are describing, this is why missiles also felt really slow to begin with. we have now sped them up considerably beyond their original ratios. We've also given players alot more afterburner fuel to compensate.
All we can really do is playtest and tweak if something doesn't work. At the end of the day though this isn't supposed to be a 1:1 copy, just to be fun to play. Others haven't reported feeling like Drayman seems to fast so far though.