One thing I absolutely hate about this game is when blobs fall on you or spiders drop down from an unseen location. I've been knocked down so many times into lava by a falling enemy I can't see that I had to stop and write this comment. Is there any way you can fix this, Arkeus?
With so many tower defence games, I hope this one will make a sequel with multiplayer. One person plays defence, one person plays offence, then alternate. That, would be an epic game.
To get 5 stars, you need to get 1000 Happiness...date a guy early, and he should give about 25 happiness per year. Get as many bonuses as you can, and the rest is cake.