Poorly executed top down shooter, painfully linear and perhaps the most difficult game on steam, and that isn't something to be proud of. This could have been a very good game if the game had more development time and some patches, if it was more of an RPG style shooter, or if the money you earn could actually be spent on weapon upgrades then it would be so much better.
The A.I is terrible, you don't get nearly enough health before being downed and then it takes far to long to be rescued, on boss fights its pretty much 'game over' and you'll have to start the entire boss fight from scratch resulting in a signficant amount of frustration. This game desperately needed online co-op to have any form of success.
Its far too linear for its own good, often revisiting the same location with newer and tougher ghosts to kill, the end of level bosses are exceptionally frustrating and take waay waay too long to weaken, all the time the boss can easily one shot you and your entire team leading to more game over screens - get used to seeing those game over screens by the way, it happens way too often.
The only saving grace and I mean this scarcastically, is the Ghostbusters comic book style story, and the original Ghostbusters soundtrack - - thats its, the actually gameplay is very poor. I don't recommend this game unless its part of a sale or bundle.