Very meh, doesn't seem well thought out. No reason to upgrade or use the "slow" or "splash" towers. They're never close enough for splash to do anything and slow doesn't work. And you get better damage/money for buying new instead of upgrading.
Too easy I thought, but that's just me... Getting a kick out of the comments here. Only "flaw" I see is that the levels are too damned long, should make the first ones like 15 rounds instead of 45.
4.5 out of 5, (so I gave it 5). I love the style, it's done extremely well and with the addition of the easy medium and hard I think everyone will be happy with this game. I just hope some badges get attached to it so people can get exposed to it.
 "My Pet Protector"){kind=icon}
 "Speedway Tower Defense"){kind=icon}
 "Mushroom Revolution"){kind=icon}
 "Fantastic Contraption"){kind=icon}
 "Talesworth Arena"){kind=icon}
 "Monsters' Den"){kind=icon}