Really clean, polished & fun, the music syncs up pretty well too. Good time. The only 3 complaints are the excessively slow movement speed, a bit of a stop & start feel to the enemy wave spawn timings and the weapon change feeling pointless at best, mildly annoying at worst. Another small nitpick is that some enemies are rather annoying to kill with the "focus shot" since they shoot directly underneath themselves and force you to scrape them with your shots or move back & forth in an awkward manner.