It’s a really interesting idea to have the number of bullets be limited.
I found it a bit hard to gauge how many bullets you have based on the indicator.
The shooting is a bit difficult, since you aim and move with the same button to move and aim, meaning you have to move towards enemies who are shooting at you if you want to hit them.
Overall, a fun little game. It’s really cool how you wrote the whole thing in C and SDL! (though I’m a bit disappointed you don’t seem to directly malloc your bullets in the code 😉)