Know About Space Is Key
In Space is Key you see a tiny square moving across the screen. Your job is simple. You press one button to make it jump. Bars and blocks stand in its way. Some hang from the top. Some sit on the floor. You time each jump so the square slips through the empty space.
If you hit a block, the square explodes and the level starts again right away. There is almost no wait. That means you get many chances to learn the same jumps. After a while your fingers know when to press even before you think about it. You start to watch the whole path instead of just the next obstacle.
There are no power-ups or extra tools to fix mistakes. You just get better at the one jump you have. When you clear a hard level, it feels strong because you know you did it with timing alone.