Fun at first, needs work – Train Merger Review

This game was fun at first, however you seem to stop at lvl 20, by stopping at lvl 20, to buy anything higher than lvl 14 car, you need to combining instead of just being able to buy it straight. It says lvl 21,22,23,24 to unlock, but still can’t unlock it. Stuck on LvL 20, don’t know what else to do...
Review by Lasik124 on Train Merger.