Impressive, considering you made it from scratch. It felt just like it's ancestor.
It felt too difficult, though. Enemies don't have a distinct shape and it was kinda hard to see them, especially when there were a lot of them in one place. They have too much hp and even while shooting them at point blank range i was constantly running out of ammo and health. I ended up completing the game by just ignoring enemies altogether and essentially speedrunning the level. Game felt good that way, trying to avoid enemies and traversing a specific route to victory the fastest you can.

I really like the aesthetic of the raycasted environment with the simple solid colors. It successfully conveyed a minimalist "toy doom" aesthetic. The gun felt nice and punchy, but the environment and enemies didn't have the same reactivity to them, and that would have helped the experience a lot.

I like the minimal take on making a Doom-like game, although it might be a bit too minimal in the sense it sometimes not clear whether something is an enemy, door or something else. I hear no sound in the game, but I only ran it in Wine, which might be acting up.