Thank your for playing and you're spot on with your criticisms of the gameplay. When I uploaded Resurgent, I kinda knew the gameplay was average but after watching some playthroughs and reading comments, I came to the same conclusion you have.
I think the main problem is that the two parts of the game (scavenging for food and avoiding zombies) are completely disconnected from each other and can't really stand on their own. The scavenging is just watching a bar go up and down whilst avoiding zombies is just waiting for them to turn in the other direction, which means that the game doesn't actually have any real gameplay.
My next game isn't going to have particularly advanced gameplay either, but I'm going to make sure it isn't frustrating like Resurgent can be. Something that supports the story rather than getting in the way. Less linear level design, (that promotes a sense of exploration and discovery), is also something I definitely want to try to do.
Anyway, thanks for taking to time to write out your thoughts. I'm still very new to game development and your feedback is incredibly helpful.