Progress.. but is it enough?

Got PGU's (Thanks Phil!) isometric rendering bent to my will last night, and have some iso tiles painted up, but I think I am going to have to re-hack in the sprite handling to use floating point tile coordinate space.
Game concept in progress:
Defend the city from highly infectious Disco Fever! Once citizens have caught the fever they dance themselves to ruin, rather than buying digital wristwatches and completing paper work. As Mayor, you will not allow this to stand! Deploy stock ticker kiosks and adult-contemporary easy listening loudspeakers to ward off the disco apocalypse!

So, funky epidemiological isometric tower defense is the order. Time to deliver!