Simple yet flexible mechanics, paired with elegant puzzle design.

It is an ingenious idea to use corners in the environment as some kind of 'mirror' to redirect sound wave that can push things from afar. This makes the puzzles way more flexible by enabling complex trajectories and the possibility to create redirection points from simple components: walls and boxes.

There are only 9 puzzles, but every puzzle has one or more new insights for the player to discover. The puzzle design is really tight, so beating it wouldn't be easy.

The final level is especially tricky. Knowing the solution, I can say that it's way more difficult than the rest of the game, and I got stuck for 5 days straight. But when I finally did it, the satisfaction was worth it.

Highly recommended.