The discourse around glory kills is pretty amusing to see so many comments online upset that they're gone when I remember people getting upset when they were introduced in 2016. Literally seeing phrasing like "glory kills are the heart of Doom", lol.
I think forced RT is going to be good for games in the long run, just with massive growing pains for a looong time.
I guess you could bump up player damage taken, reduce damage you do to enemies and increase the speed of enemy projectiles a bit to make it a bit tougher.
So I've been playing with max enemy projectile speed since about chapter 2 (on 13 now) and they still seem kinda slow tbh. I turned it up at first just because I was bored of waiting for the green fireballs to reach me.
Honestly, anyone who likes their games even sorta tough should just go straight to Nightmare.
Feels about the same as Ultra-Violence in Eternal. For context I haven't gotten far in my Nightmare run for Eternal. Didn't finish Nightmare on 2016 yet either.
Overall I think Parry Doom is pretty fun and I also like that it stands with the other two, like a Doom version of the Cornetto Trilogy.
I'm kinda whatever about the mech and dragon sections, though. They're... fine?
Definitely wouldn't miss them if they suddenly vanished tomorrow.