Really neat Sokoban variant - having the 'boxes' be atoms with a (looks to be correct) enthusiasm to stick to each other is very clever because your 'boxes' get bigger and bigger, even if you didn't want them to just yet.

Throw in the notes on the compound you've ended up with and you might even learn something.

Definitely worth getting in a sale, whether it's worth full price to you depends on how much you like Sokoban variants.