I've downloaded and installed the app, it is an interesting game idea. Seems nice enough for something I was goofing around with. I made it to level 4 in a few minutes.
Aiming the wand is a bit... too responsive and unresponsive at the same time. With your finger on the wand, it is easy to move it around slowly but when trying to quickly move, it seems to lag just a bit.
Besides movement, aiming was an issue for me. Perhaps I'm just ignorant of this aiming mechanism, but I couldn't figure out where/what I was aiming at with any confidence. Am I supposed to depend on the "arc of fire" or the "line of sight" along the ground? Perhaps a combo of the two? Hmm.. maybe change the "line of sight" line to a darker color? This way the user can use either/both depending on what they're comfortable with? Using a darker color for the line, de-emphasizes it as the primary aiming method (if that is what it is).
A wand isn't a gun, but perhaps something more like the sniper's red dot (which gets slightly brighter and larger) when a target is within range might work better? Well, some kind of tweak or improved aiming method might be needed.
I'm not sure if it's a standard Android OS usability feature, but I pressed the back button to get out of the game and nothing happened. I would suggest allowing the back button to return the user to the home screen which appears to be SOP. Also, there was a menu (three dots) at the far right which did nothing when pressed. I realize that this last one might be an incomplete feature.