Thanks! Great Let's Play.
- I'll be looking at adding in a height measure so you can tell how high you are in the sky
- The road markers are every 80 meters, not 100 which is why the distance doesn't line up with them. I just wanted them to be close enough so you don't feel 'lost', but I might change this
- Acceleration really does less and less as the game goes on because of the ramp and runway
- Earnings increases your money earned by 10% per level
- I have got some other suggestions as well and will be rolling them into a future patch. Not sure when I'll get to it though.