Hello, and congrats to your game!
I gave it a go and got some fun out of it! I really think the footsteps worked well setting the atmosphere and giving an unnerving sense that there are enemies closing by.
Indeed at some points as the aim is a bit tricky and there is not a lot of ammo and health around it ended up being quite challenging. Maybe adding more drops, or even positioning than a little better? Or adding a melee weapon as well.
Anyway, once again, good job!