I liked the way the directional combat played out. It would be more entertaining for the enemies to have different attributes other than speed, once all the super fast enemies were immediately dead the game was just me standing still waiting for the orbs to finally die, and once the orbs started to build up as i couldn't even kill them in time for the next wave. I'm also unsure on what the pickups were. Overall i like the concept. i think that once all the enemies are dead the wave should refresh immediately as well.