There's no boss, but we just updated it with a lot of sound effects that should be better feedback! I'm going to see if I can set the ammo as unlimited while you have the speed powerup enabled.
Played again tonight and the added effects and the items being drawn to you as you get closer is wicked! You could kinda run away from items to keep them following you, then when you were being bombarded you could collect it and let lose! I think my computer is a bit knackered cos when I got to a point with loads of items spawned and loads of bad guys, the game slowed down a lot, but I really think that’s my computer and not the game.