I'm unfamiliar with the source material and I've never played the Amiga, but I played the first 2 levels here on medium difficulty. Good and challenging. Weapons feel good. Especially that bouncing grenade launcher.
There are some tight coridoors lead the gameplay to be shoot first.
Only real critiques I have so far is to ask if there's a way to eliminate GZDoom keys if they aren't used in game. Unless I haven't made it far enough for the jump key to be used.