I am absolutely torn. This could have been one of the best games in the jam. The gameplay is smooth, the shooting is cool, controls fast and precise. There's enemy variety, not just in looks but in behavior. The camera angle is not disorienting (could be a bit further maybe, but that's not a huge issue). The graphics I love. I'm a big fan of 2d + 3d. The animations are cool, especially the shot looks powerful and meaty. The 3d models are properly oldschool, fitting the pixely grandpa and monsters.
Then there are some weird decisions. The house is a bit too big- at some point I went exploring, and I think maybe enemies couldn't find me? You could use it like "now the monsters are invading the kitchen, and after that they are invading the gallery", and then the huge house would become more of an asset :) The random monsters attacking the house don't feel like "guests", so I guess you could have gone harder on the theme.
Then there are two things that just don't work. The most obvious is lack of sound. At first I checked my headphones, because it made no sense to me that the game that looked this good had zero sounds! There are many places where you can get sounds and music for free (freesound.org, and mobygratis.com come to mind). Sound does wonders for atmosphere and player feedback. The other is that enemies stop spawning after wave 4. Some kind of "you win" screen would be great. And instead I kept waiting for some bad guys to show up.