Since you don't have aim assist it can be hard to hit the enemies, so destroy the carts instead. Your gun is an automatic so you can hold down the R2 button to take 4 shots to damage them. This doesn't work on the chainsaw guy's cart though.
There's a save point that might be missable after you finish the first mine cart area and dock. I didn't notice it until a couple tries. Also, when you get to the big open area you can see a cart toward the top of the mountain. Unforunately, I didn't get that in this video, but if you shoot it you can avoid dealing with it later.
![](https://i.ytimg.com/vi/xz9DUuoVz5w/mqdefault.jpg)