This game's very addicting, but also really buggy. I placed a tower and it refused to fire at anything (and yes, I was at full power). This caused me to lose the game (GREEN NUUUUUKES! *shakes fist*)
This game really reminds me of Super Wario Land 1, the way you collect money and at the end get a different ending, depending on the amount of cash you've collected.
The guy looks like Wario too.
Goddamn WASD. Can't you have a key configure option? I'm sick of this, it ruins the game for me when the controls are unbearable and I can't change them. DO SOMETHING.
This is a typical error in your games: WASD controls. I have an ASDF keyboard, if you're going to have them set as default controls, fine, but at least have an option to configure your controls so I can use the arrows set for pretty much every keyboard in existence. This pisses me off, it's a major flaw and makes the game impossible for me to play properly.
Change it, please. :)
This game is fun, the best part about it is combining the gems to make new gems. Sometimes you need to think about which gem to put where. Very nice game.