Isn't it interesting that you did the blood in an ambiguous way and it pulled focus. The first time we see the blood, you show us only a glimpse. Then it feels like it's being hidden because at the same time, we question the color and texture of it. And we want to know if he was shot so we focus on it. And, of course, spattering the blood onto the shirt would've probably worked better. There are lots of blood recipes out there, but one I've used is corn syrup, red, blue and green food coloring - and a little Clorox if you want to make sure it washes out well. It's gooey, but can make great spatter as well because there's a darkness and 'substance' to it. If you make mouth packs, leave the Clorox out of those.
What most interests me in a great film is how it peers into the psyche of a character, particularly in moments of clarity or shifts in intention, etc. If your actors are doing good work, get in there and let us see it, particularly if you don't have time for lots of cutaways, etc.
What popped out at me right away were the opening shots. Really majestic. You let those breathe a little and it felt a bit cinematic. The next shot of the truck, however, felt like a camcorder in-hand kinda thing. The dirt on the truck didn't help, but even without that, it felt like a different movie. If the intention is to make a drastic shift from serene & beautiful to "down and dirty," then make that shift with some strength. Zero in on something that's gonna jolt us a bit, get us to respond, to feel something.
I understand you shot this quickly, so I'm certainly not criticizing the filmmakers here. On the contrary, congratulations to you for gettin' up and doing it.