Great game! The graphics and ambiance are very good, the voices and intro cutscene are a nice addition! I love the atmosphere, but the game seems a bit too hard : starting with only 2 bullets is rough, when I feel like the core gameplay is about shooting stuff x).
The controls feel a bit strange, but I got used to it pretty quickly. There are come little collision bugs, but hey, it's a 7-days jam game, it's already amazing that you could do so much in such a short time!
Overall, it's a pretty good game, and I would be curious to play an updated version, to see where you can bring this game =)!