Probably the most polished game I've played so far - not only does it run well on mobile, it does so in 3d, and with great art. I think this game could be expanded to great effect - the idea of a famous magic bullet is very appealing, and combining that with a wild west narrative and more complex arenas, it would be very cool. I didn't feel like the difficulty scaling was very high in this game - level one was hard, but levels 2,3, and 4 were about as difficult. Solid barriers instead of drifting debris would be my recommendation - and make them larger!