Fun up until about wave 10, then your turrets do all the work for you... In fact I'm writing this comment while they are killing all the enemies right now. Didn't even need to pause.
I don't care too much for games where you can feel like you're doing it exactly like the walkthrough and get a different result. (I'm talking to you, level 30)
If you want to increase your score a lot, don't grab any pixels. Just stay in one place and kill stuff. I went from a high score of 700k to 3 million in one game because all my points came from easy guys.
Overall a very great game. There is definitely strategy involved, but not so much that it becomes overwhelming.
My only wish is that there were more achievement-like awards to win that were a little more difficult than the "top score" in each deck. The top score was very easy to obtain once you got the hang of it.
 "Boondog"){kind=icon}
 "Wings of Genesis"){kind=icon}
 "Moby Dick - The Video Game"){kind=icon}
 "Thousand Dollar Soul"){kind=icon}
 "Bunny Flags"){kind=icon}
 "Try to Survive"){kind=icon}
 "Gravity Duck"){kind=icon}
 "Rocket Science"){kind=icon}
 "Wake Up the Box 2"){kind=icon}
 "Robot Wants Ice Cream"){kind=icon}
 "Reincarnation: The Backfire Of Hell"){kind=icon}
 "Recordshop Tycoon"){kind=icon}
 "Hide Yah Kids!"){kind=icon}
 "Pixel Purge"){kind=icon}
 "Quick Switch"){kind=icon}
 "Air Transporter"){kind=icon}
 "Tile Factory"){kind=icon}
 "Reeelz"){kind=icon}