I've found this game on notonsteam.com and instabought it, worth it.
The mechanics are based on 倉庫番 (sōkoban) which is a type of transport puzzle.
In this game, the player will push atoms (displayed as Lewis' Ionic dot structure) to form molecules (Lewis Theory of Bonding).
After completing the task, it will display a small info card about that completed molecule.
It is pretty educational but if the molecule repeats, it won't give you any new factoid :(
The sound of this game is just special and unique. The feedback sounds are diffused amazingly in the ambient background, building up a very calm scenario. For a non time-based puzzle, I didn't expected such good sound works. But like the molecules information, the sounds are very limited too.
The game progression is very simple, it follows the complexity of the molecules. The maps can be solved using single-agent search algorithm. But sokoban are known as NP-hard problems (Non-deterministic Polynomial-time hard). The puzzles can exponentially grow the branching factor of the moves which can be very challenging.
Sokoban can be a very entertaining way to keep your brain active but cannot be considered a game for the casual.
Interested in more sokoban? please visit the official site: http://www.sokoban.jp