That's a fun little arcade type shooter, my high score was 457 lol. I am not sure if you could get more bullets, I never ended up finding any, but turns out you can survive the zombie apocalypse by running around a big house.
Ok jokes aside, I had fun and I did spend quite some time testing it and seeing what is the best way to gain points and such. I seriously might have been just missing all the health/bullet drops if there was any. I think in terms of gameplay it is solid, but I feel the game lacks the incentive to actually kill zombies. Maybe I suck at playing, but all the time I did attempt to actively kill zombies I ended getting way more hurt, so I kinda just figured I didn't need to do anything else but to run around to gain points over time. If there was sprint mechanic or something else that forces you to defend yourself in other ways the gameplay loop would become more sturdy. But then again, maybe I suck at these type of games, so take everything I said with a grain of salt ^^
Overall I liked the vibe of the game, the low-res style and sounds went nicely, the atmosphere was just perfect to show that "night" part of the title, but not too dark to hinder the more active gameplay. The zombies looked really fun too heh. So I had fun, great work!