I've been persisting. Still confused by the torch -- I assume that's what's beeping as it runs down? But pressing e sometimes works sometimes not but I don't notice a lot of difference in lighting. I'm sure this is user error.
Also I'm struggling with the difficulty/variance. Some levels I find the needed item very quickly and can zoom to the next level. Others I have to search for quite a while and usually get killed before I find it. Enemies are brutal but some more brutal than others even on the first field. E.g., sometimes enemies have 7 health vs others that have 2. There's not often a way to escape them once they have you in their sites and you quickly run out of ammo.
Also the game says "1 of 4 fields cleared" from the very start of the level but I assume that means I'm starting the 1st of 4 fields?