The best game you've never heard of! – Starfall 2 HD Review

Hands down, this is the best tower defense game available for the iPad. If you have the new iPad, especially, you will be impressed with the graphics and smooth gameplay. Starfall 2 has a very fair learning curve, but gets sufficiently challenging the further you go in campaign mode. Loads of unlocks, research upgrades and a large armory add to the fun. While you can always go back and replay levels in campaign mode (useful for helping you push forward), the mini-games mode provides many hours of additional fun. Well-worth the $4.99, a really nice surprise!
Review by QAPete on Starfall 2 HD.