Fairly fun. Needs a couple things: a way to get back to the main menu from play, and click-and-drag scrolling on the minimap. It'd be nice if you got some more time before the first wave, too.
Honey, let's go shopping. We need a nice dinner out, groceries, a new couch, a stereo system, mother-of-pearl earrings, a new pair of pants, a dog, and some X-Men figurines, in that order. And we're going to pay for all of it in coins. Hope we don't run out. Ooh, and maybe we can get some shameless public dancing in while we're at it and read three or for newspapers.
Man, the destroyer is pretty overpowered. Spamming those with a couple battleships and some bombers if the enemy gets clumped make short work of pretty much any level. The aircraft carrier is pretty useless.
So... easy... The boss fights are even easier than the main game. Didn't die once, even after drinking heavily and forgetting to buy upgraded arrows several times.