I'm surprised nobody's mentioned
Selaco, a sci-fi gzdoom shooter with sim elements. unfortunately it's been in development forever and the current release date (5/30/2024) is for the start of early access, lol. however the demo is good as hell IMO. I'm very much looking forward to it.
another good gzdoom shooter I'm on the train for is
Supplice. at first glance it doesn't really seem to have much going for it except the tight pixel art style (the art is being done by the Ion Fury guy). but real heads who follow the Doom modding community will be interested to know that Pillowblaster (
Russian Overkill,
Guncaster) and esselfortium (Back to Saturn X
E1,
E2, and hopefully some day
E3) are on the team, among others. the gameplay and mapping are extremely tight. it's another early access project but progress is coming along steadily. they recently released episode 2.
Forgive Me Father is one of my personal faves, an obvious Lovecraft tribute with a unique art style and some light RPG elements. there are two playable characters with different abilities, and the skill tree allows you to mutate your arsenal to improve or even change the function of specific weapons entirely. it has a
sequel in early access.
Project Warlock takes more after Wolf3D style games. I enjoyed it a lot, it has some fun ideas, especially the upgrade/spell system. it also has a
sequel in early access that's much more ambitious for better or worse. much of the game design has been changed drastically from the first game, so YMMV.
for the roguelike-likers, there is of course
Devil Daggers and its sequel,
Hyper Demon.
Chop Goblins is similar. if you're also a Schizophrenia Enjoyer like me, check out
Post Void.
side mention for
Incision and
Boomerang X. also,
whatever the fuck this is. there are more I'm not remembering right now, I'll add them later.