Aaaw! A game about a cute little boogins!
I liked the balance between "I want firepower" and "I don't want too mess up the house" (although in the last level I just massacred the whole house by accident). The upgrade mechanics were cool, but it would be even cooler if the upgrades had more impact on the gameplay (the shotgun is a good example of this) instead of just making you faster/ tougher.
Graphics worked fine. Sound worked great. I can't put my finger on it, but it just fit the gameplay completely.
As for the theme- I liked the twist that the thing coming out at night is the player (it's just the 5th game I played in this jam, so it might be that there's gonna be 20 games that do this, but yours is first, so it counts :))
One more thing. I like that the roomba returned. Now that it's featured in two games in the row I expect it as a recuring character :)