The premise is interesting and the game itself is really fun... but not long enough for it to be worth its price. You'll finish the game in about half an hour and if the mechanisms of the game don't charm you you'll be tired of it before that.
A lot of work has been but in the game, each object has its own effects and all, but it's not really enough to make you want to try them all. There are different ghosts you can unlock but they don't do anything different apart from slightly changing the sound you make when pressing S.
The controls are kind of unfinished too, mostly I expected controller or mouse support but there wasn't any. It's all done with the keyboard and in a kind of awkward way (you use S to confirm in the menus instead of Enter or space, and D to come back instead of escape).

If you want some bit of fun I recommend it but only if it doesn't bother you to put 5€ in it. Which isn't a lot in itself, simply, the game suffers from the comparaison to other amazing and long games you can find out there for the same price.