Nice game! I always like these kind of shooter roguelikes. I noticed that the frame rate started to drop after I played for a while, it seemed to only happen when sound was playing so maybe it's related to that? Other than that I think working on the movement controller could make it feel a lot better. A lot of games start out at a slower move speed when you start moving and then lerp to a slightly faster movement speed after you've moved for a second or a few seconds and it ends up making it feel more real and less like instant force velocity.
Congratulations on making a game in 7 days!