Overall… it's fun, but does get frustrating on the later levels… the fact you can't save your game to try a configuration and then reload if it didn't quite work simply adds to that frustration. At the current price tag I think it might be a little much… but there is a bit of value in the unlockable comic pages and the ability to play through as a couple of other characters is nice. Perhaps wait for a sale unless you happen to really like tower defense style gaming.
It's great to finally have a game that seems to put you right in the middle of one of H. P. Lovecraft's worlds… that sense of strangeness that lies over everything like a fog that draws you in and embraces you in the oddness of it all is quite compelling. Best played at night with the lights off to truly become immersed in the world of The Sinking City.