The mouse sensitivity, the frames seem jumpy, there's some walls with no collision (as a player, we can go across them) and enemies projectiles don't seem to hit walls, they can shoot the player even if there's a wall, it's not possible to hide and shoot when encountering shooting enemies. No health pack, and full reset when we die. All of this make it difficult to navigate through the level.
I'm sorry for the sound issue. I hope there'll be a way to make these two components work together correctly at some points.
Keep up!