This feels almost like roguelike! Cool.
I really like the slowdown when preparing a jump. Intuitively I want to hold down space and release to make the jump. Took some getting used to. Some trains went boom there.
The transition to shop music is quite annoying :D
It can take quite a long time from running out of coal/water to reaching the shop. It could have been nice with a score popping up and maybe a sound telling you that it's over, and then faster into the shop.
Alright, I got to 136kpx. Felt good!
Amazing what you made with 1 button!