I think the snipers need a little tuning, I had a lot of trouble with the snipers cause dodging out of their way (when there was 4-6 of them spawning in a room) felt really impossible since they were effectively hit-scan, so while I'm trying to get to them so I can shoot at them more reliably, unless I enter with >130 oil I end up dying almost immediately.
Other than that I really love the idea to have oil be both the time constraint, your ammo, and your health, a really unique take on a resource management shooter!