Not bad. It gets frantic, and my typing ability becomes more of a limitation than my math ability. Especially when it occasionally drops a digit. Also, I'd like an upgrade key for my cannons. It's annoying to have both hands on the keyboard, but I have to reach for my mouse to upgrade. How about U=upgrade current cannon; I=Repair outermost wall for current cannon; O=Upgrade outermost wall for current cannon; P=Upgrade 2nd outermost wall for current cannon. And don't bother to confirm the upgrade, that's just annoying.
Well, I had it all sorted except for the 13 in the extra space on the bottom left, but it wouldn't move. Plus, it's a little ridiculous to give this game a "3D" tag.
fun game, but I think I found a bug. Backstab is never available, even right after I've used a Hide card. I've even had times when I had Sneak Attack and Backstab both on my board at once, and the Sneak Attack is available but the Backstab isn't. (I had plenty of energy.)
Yet another of these games where you play with keyboard but still have to reach for the mouse to say 'Next.' Do you guys all share the same idiot piece of code? Is it really that hard to let spacebar do the obvious thing? Anyway, this version had a little smoother control than most, but nothing interesting going on in the game.
Nice! Some of the flavor of Chronotron, with a different spin. I agree, though, it was too easy. More colors, and more challenging, please. Provide a level editor and you'll probably get submissions.