Just wanted to cosign the dimensions part--an easy solve as you say would be just to shrink the starting numbers, although it may also provide cover for early-mid game rebalancing as will inevitably be needed when updating for polish imo. The dev would be wise to consider your extensive feedback, I think.
EDIT: to elaborate on the point, Olympus Mons on Mars is the tallest mountain range in our solar system at a little over 21 km high. I'm not even sure a megameter mountain is physically possible, given the apparent limitations of terrestrial planets. (<EDIT again for SciShow link)