Slimetris: Slime ASMR Puzzle is a block puzzle game with elements similar to the popular classic Tetris game. Level by level, the player's goal is to perfectly align and drop slimy gelatin blocks molded to form polyomino and other shapes into a narrow space cutout in a wall. They must never allow the shapes to stack up beyond a black-dashed horizontal line at the top of the area.
The player receives two or more shapes to drop at any given time. They use a semi-circular arrow icon below a shape to rotate it into the best possible position for stacking it in the space. When the player drops a shape into the cutout area, it bounces, slides and shakes a bit. The shapes all have the same type of give and texture as real-world gelatin blocks. The shapes also act in realistic ways when dropped into place.
Slimetris: Slime ASMR Puzzle provides the player with a wide, shadowy band below a block to help them guarantee that they aim a drop with precision. That said, even if the player fails to make perfect drops, they merely need to try again. The game also provides them with a free reload button to use if they make a mistake and want to start over.