The game Bloom Mee uses a 3x3 grid where i tap on colors to match answers and earn points. Plain visuals are the first thing noticed when starting the game.
Tap on the right color to make flowers bloom and you get points.
Controls are not stated in the description. The game has two modes and a 3x3 grid.
Most players should focus on the 3x3 grid first. The mechanic is to match the right answers to blossom flowers.
Q: What are the controls? A: Not stated
Q: What is the objective? A: Earn a high score by matching colors.
Q: What is one stated feature? A: The game has two modes.
Q: What is the main mechanic? A: Tap on colors to match answers.
Start tapping on the 3x3 grid to match colors and earn points, then I think the plain visuals are fine, use Bloom to learn the controls and objective, finish levels with two modes. I like the simple mechanics.