I just played a limited game on steam for free called serioso sam. It's about some american stereotype wearing dark sunglasses and an impressive body mass. Maybe the croatian version of duke nukem or something.
The demo allows you to play one level, which at first I thought was level one. But after some poking around I found out that the free level given in the demo was actually closer to around level 11. Huh. Well, okay.
Gameplay consists of large, open spaces with plenty of room to maneuvre. This is supplemented by having hordes of monsters to battle at once. So what kind of monsters? Well mostly you have some humans that were victims of the French Revolution, accompanied by what looks like monsters from a Super mario game called "wario's woods" (image search "galrog wario woods" you see what I mean.) On the higher end of the danger scale we have undead steers and what looks like obese madcows, along with harpies and those bipedal mechs from Star wars. I like the variety.
Setting: Egypt. The game didn't tell me any plot exposition, seeing as it is a demo. So I'll just make one up: Sam is on the run from aliens and is trying to plunder ancient egyptian pyramids for artifacts that will help him unlock doors so that he can get somewhere. Why do the aliens want him dead? Dunno, maybe they're just mental or something.
This game features what can essentially be called a Pokedex that travels with you and subtly helps you out. Everytime you see a new pokemon err I mean a monster the pokedex thing will automatically update itself to give you useful information about it. Like how a red scorpion looking human toting a chaingun is very dangerous because of its religious convictions.
There was one thing I didn't like about this game: it was how monsters can spawn right next to you. Gameplay is usually a trigger_once that triggers a multi_manager that targets a bunch of monstermakers. If you see a good item lying on the ground (or rather, floating magically above the ground) then chances are there's a trigger_once covering that area. I made a radically bad mistake when I approached a healing pickup that I didn't need. Because when I got there, some people appeared and yelled at me that I made a stupid move. Apparently they think their yelling wasn't loud enough so they ran towards me holding large black boomboxes still yelling at the top of their lungs. It was very hard to communicate with them.
I think this game is very simplistic. Large open areas, lots of evil minions. Shoot. Blow stuff up. Then maybe get blown up yourself. Lots of action. Fun. Everybody, give this a try.