I like it! My only complaints are that the instructions do not explain what the upgrades and items do (I still don't understand what the gemstones do), and I wish that the early parts had music. Otherwise, this game is spotless.
Although I got the badge on my first try, I still thought this game was a bit difficult, especially the first level, in which you're just learning how to play. I wish that the lasers were faster though...
I thought this is a fun game. There's more luck than skill, but being able to beat up your opponents properties and laughing about it as your stocks jet up makes this game slightly addicting. I agree that this game needs more cards, including cards that can affect your opponents cards...
 "Orb Avoidance 2"){kind=icon}
 "P.O.D."){kind=icon}
 "Bowmaster Prelude"){kind=icon}
 "Gamma Bros"){kind=tracking}
 "Castlewars"){kind=icon}