I tried it out and I liked it.
The fonts are hard to read with the "pixelated-render" effect. I think the resolution makes the whole game kind of hard to read but I got used to it after a little while anyway.
Reloading and moving at the same time is kinda tricky because I kept having to hit "R" which keeps me from strafing while moving. I think I would rather use spacebar to load a shell into the magazine.
It would be cool if you could reload the shotgun while keeping it shouldered.
I really liked the way you animated the reloads, attention to details like throwing a shell right in the chamber if the pump is pulled back, the chamber check. Having to scroll down twice to really send the pump back feels pretty realistic as well. This game feels the same way using a shotgun for the first time does, which is really cool