If anyone wants to do a little cheating (for fun - don't submit your scores - that's not cool), I've edited the game and put it up here.*

You'll start every game with 9999 gold. The only problem I've found is that there appears to be a limit on how much you can build, and I'm not sure what it is, but after a certain number of upgrades, the game will simply freeze and you'll have to refresh or reset. Too bad, I would have loved to cover the screen in maxed-out squirt towers. Still, it's easy to beat any mode with this cheat (except, oddly, the "Cross" fun mode - I haven't found the correct setup for that one yet).

* ps- sorry if you can't open RAR files.