I changed my mind about a lot of design and lore, as I found really cool free stuff for a more wild-west style. Going to update my GDD as well. I do not want to bother with creating my own assets for now, so making the best out of what I find for free is crucial.
Here is how my first level looks like now:
The goal will just be to kill all enemies and exit the square. Might add some more enemies, make the first encounter sort of an assault.