Planets Under Attack is a simple RTS, very easy to get into, but it actually gets really challenging as you progress. This is not a bad thing as games these days normally hand-hold you to the end, I liked the challenge on offer here.
Graphic wise, I actually quite liked the style on show. The comic book style art really suites it well. The story is pretty pants, but thankfully it's not all about the story here, it's the gameplay.
It does have a very addictive side to it, I found myself being hell bent on getting the three stars available on each level. I have yet to try the multiplayer mode, hopefully there will be a player base out there, that will make finding matches easy enough.
This is more than likely to be included in bundles, so keep your eye out.