I think the game just called me back to play it. I went afk a second to finish my oatmeal and left my mouse up as I did a launch, and I got the invincible medal (Hit 20 objects and survive) while I was eating. Kind of scary.
I have been a fan of games that Untitled comes out with for quite a while and I like that he experiments on the style of game that he makes. It's one of the only ways to learn how to make a better game that people will love.
I would suggest putting a quest arrow up that people can use to find their quest and adding in different maps with hero's that use different items and play differently if possible. I'm a sucker for a story mode and I like the style, I think that adding a bit of story to the game would not hurt if you expanded on it and made a mode that were more like an RPG where you could run around doing quests and adventuring. That would take a while longer to make but through your style of game I think it would turn out really fun to play.
Not a huge fan of the game type which may cause my thoughts on the game to be a bit biased.
As much as I would enjoy killing vampires any other day the music kind of takes away from the game. It's quirky and fun but...I feel like I am in the middle of a really odd freakshow at a carnival when playing this. I would suggest looking into other music options for the game but the voice of one person is really not that important. Hopefully other people like the game.
 "IntoSpace!"){kind=icon}
 "Quick Quests"){kind=icon}
 "Exterminate The Bugs"){kind=icon}
 "Kill a Vampire"){kind=icon}
 "Shore Siege!"){kind=icon}