There was an update lik a minutes ago. It simply bumped gained exp x2. For level 14 I needed to farm for levels 12-13, total 135600 exp, I'm gaining ~5k exp per minute, so only half an hour of farming to unlock stage 18...
I just farmed stage 17 for 9min 15s, got 23880exp, so it's ~2500 exp per minute. Getting level 13 will require farming for 23 minutes. Do you even tested it? Or at least counted?
I'm on stage 17. I have 12lvl, and I need to get 14lvl. Destroying ship gives me 24xp, red meteorite ~16xp. I currently have 11439xp, for next level I need 56200. So I need to kill only 2500 things to get to next level. Are you sure with leveling balance?
it's hard to call this "learning" as my motorcycles completly forget about the best try and instead of improving it, they creating it from scratch so every run is almost the same
population of 30, 5 crash almost at the begining, next 10 on 1st or 2nd turn and rest are managing to get to half of track, same scenario for over 50 generations, they are not learning at all
You can complete achievements to earn exp and coins.