Welcome to the forums @WaterThornz!
It is definitely possible to make something like Plants vs. Zombies in Godot! Godot has everything you would need to make something like that, you just need to figure out how you want to go about it and put it together.
I would suggest taking the design of Plants vs. Zombies and breaking it down into small, simple steps. Then, work on each step at a time. Not only will this make it easier to see progress, but it will also make it easier to get help with the smaller steps than bigger ones.
As for the camera issue, have you made a Camera2D node and checked the current property checkbox in the inspector?
