It's not fair on Rage that The Binding came out at the same time. 

Someone should "borrow" those monster models for a Quake mod! 

Too disturbing for Quake :)

The four horsemen are already on stained glass windows, making them Quake mini-bosses would be cool. 

Nah, too Hexenish. 

Thinking ring-wriath but more stylized like in TBoI.

So maybe four ogre bosses, like that one from the mexx series could be War - a berserk ogre, basically, but in a small space with lots more health.

...or four Shamblers... 

War: Melee only,does berserker charges like a bull that knock the player around.

Pestilence: Regular shambler, but when killed splits into two smaller, faster versions that cause less damage. Each subsequent version also splits.

Famine: No melee but drains player's blood by proximity. Constant Blinking, teleporting around the place and launching multiple lightning attacks.

Death: Lightning strikes cause persistent black spheres which cause constant damage to anyone touching them. 

Those 4 are not Shamblers, they are the horsemen of Apocalypse... though... 

The 4 Shamblers of the apocalypse!

Mom is beating the crap out of me - I beat her pretty quickly a few times, the last 3-4 times she's killed me when her bar's at less than a 1/4 each time.

The little adds keep on scraping at my health and the game slows down completely... 

I never died in any of the Mom battles. The monster she spawns can be either ignored or taken care of if necessary in-between the stomps. Many times they are killed by the stomps - try to stay in the center of the room and spam the eyes.
In the Mom's Heart battle you can put a bomb there that will damage her and destroy the new monsters right as they spawn.

What I find more challenging than finishing the game now is trying to play through the levels without getting hit. Except for the basement I always managed to screw it up somehow, even in runs that looked most promising at first (having good stats + shovel and all).

Good hilarity sometimes.. well, annoying fuckups. Like when I deperately needed a key earlier and hit the slotmachines. Three dollars but no key. Eventually I got one somewhere and rushed towards the room with the door, only to accidentally waste the key on a padlock right behind an entrance.

mh: Definitely. They would make for some badass Quake monsters. Not only or necessarily the bosses, but the regular enemies, too. 

Orphans 

I was sticking to the corners.

3 completions now, not long to go...

RMQ has had work done on it btw - it's sat on another HD. 

I think it's coming to Linux too. Holy crapper - another decent Linux game. 8P 

For anyone wondering about the difficulty in this game, it's brutal and uncompromising at first, but the longer you play and the more items you unlock, the easier it becomes. I'm surprised Bal hasn't 100%ed it yet, though.

I'm still missing some 8-10 items. Trying to beat the game with ??? now, which is a very tough challenge and even more luck-based (he only has blue hearts). And damn that Super Meat Boy achievement...

ijed, try Cain or Judas. They are good for regular runs. 

Linux? Wow. I might actually have to get it.

What a shock.