Stick Soldier

There is exactly one control: press, hold, release. How long the finger stays down decides how far the shot travels. Too short and it drops into the gap, too long and it sails over the far side. Nothing else is adjustable.

That simplicity makes it harsher than it looks, since there is nobody else to blame. The distance changes every stage and no number is ever shown, so you have to build a private sense of how much hold equals how much range. It is a genuinely learnable feel, and the improvement is obvious after a short while with it.

Thin line-drawn figures on plain scenery keep the eye's work down: everything visible on screen means something, with no decoration to sort through. That makes this a natural fit for a phone during a wait — a stage or two at a time, put down without any worry about losing your place.