Hippo Toy Doctor Sim Game
Off The Rails 3D is a train game where the goal is to reach the station before fuel runs out, and i find the main mechanic of tapping to speed up while collecting coins to be simple.
Tap the screen to control speed, manage fuel, and collect coins to reach the station.
The only stated control is tapping the screen to speed up, and the game features coins and fuel that runs out.
Collect coins early to reach the station, and tap carefully to save fuel.
Tap carefully to save fuel and reach the station without running out.
Speed up by tapping to manage fuel and collect coins while reaching the station, I think it is simple. Use Railways Train Simulator Game for a related experience and tap carefully to avoid running out of fuel.