This game is really good. It's a 4-players co-operative game with 7 maps and 5 difficulty ratings to complete alone or with friends. There are four classes in the game to choose from, some weapons requires a specific class to use. You level up and unlock new weapons and gadgets for each level to a maximum of level 27. If you enjoyed unlocking weapons more than just playing with the weapons, you can choose to get a promotion, similiar to "prestige" in the "CoD" series, and start from level one.

It's a very good game to play with friends, especially if concidering that it's a free-to-play game. It also unlocks a hat for "TF2" after you have completed 2 maps.

Fantastic additon to the "ghost hunting" game genre. Builds very well on established norms for the genre regarding the kind of evidence you'd expect to find, but has its own unique take on what exactly to do with the information and what else to look out for.
The gameplay feels smooth.
The ghost types are unique and identifiable through alternate means, allowing an experienced player to show off their prowess.
Most, if not all, pieces of evidence have some way of semi-forcing them to happen within a reasonable timeframe, meaning you won't always be stuck playing the waiting game for the ghost to do something of note. Some luck is of course still involved, but only about the amount you'd want to keep the game interesting.
The developer also seems very dedicated and down to earth, and is quite open to feedback, so the game is only getting better.