Hi snuffysam! Thanks so much for the feedback!
The number that you mentioned, it’s in fact the remaining distance to the Moon and indeed it changes, but at a different pace depending of the level, please let me give you more detail.
There are 6 levels on the game, they are structured as the Earth’s Atmospheric layers (Troposphere, Stratosphere, Mesosphere, Thermosphere, Exosphere) + Space. The first three ones, are rather short (10kms-30kms-50kms) so the speed is lower and kms move slower as well. Once you get to the fourth level, things start to speed up since there are longer distances (400kms-10000kms-384400kms).
I wanted to have some “realistic measures” (I even calculated the real-time speed but I ended up dropping it because I thought there would be too much info in the UI), as well as the player to spend similar time in each level, there might be better ways to do it but that’s the how I solved it. I hope it clarifies a bit :).
Thanks again for your input!