Fieldrunners is a tower defence game that made some waves on iOS (not a mean feat by the way) in 2008. It’s now available for the Mac, although the sequel is also out (only on iOS for now though).
Seeing as it’s a tower defence game, it probably doesn’t matter that it’s a lacklustre port, and might be worth a look, especially as they’ve done the smart thing and priced it lower than the iPad version.
IGN’s Levi Buchanan said (of the iPhone version): “this is a fun Tower Defense-style game that I have literally sunk several hours into thus far.”
Hmm. Praise (after a fashion) indeed.