Im impressed with how much work went into this, haha. You have so many characters, powerups, an inventory system.. It was a lot of fun having to manage both directions, and this is an interesting take on the tower defense genre. Only critique I'd give is I'm not clear on the benefits of the different units, and I would like to be able to click and drag the mouse to pan the camera as that was how I first tried to move it. Great job, Ivan. :)