Regarding the Steam Game Festival...
Party Animals: Played a few rounds with a buddy, seems boring and repetitive. WYSIWYG game about cutesy animals hitting each other in Multiplayer trying to throw each other off a platform.
The Survivalists: Acceptable, but kinda boring too. Reminded me a bit of Don't Starve, but worse. Maybe something if you're into that kind of stuff and looking for something new.
UnDungeon: The pleasant surprise from some of the Demos I tried lately, and relatively promising. Seems to be a Russian-developed ARPG but with a lot of Multiple-choice dialogues and generally a lot of lore. The story seems to be about 7 Multidimensional earths merging together and some of the Cinematics I've seen so far seem snazzy enough, even though they're Pixely:
It has a bit of a Fallout feel to it too with you traveling a Wasteland via an Overland map containing things like non-combat settlements, temples, ruins etc. while the weirdness of the world and the characters you meet are closer to Planescape. There's lots of exploration of new places and travel takes days getting between two points of interest (although so far I can't see a time-mechanic that would make you hurry up). You have to dig for more information about where interesting places might be nearby through dialogue or exploration and need to do shit like find or buy a Translation device to be able to talk to the locals. There's also random Encounters on the map from Ambushes to other combat encounters or meeting Traveling vendors and whatnot.
There's Barter Trading where you can offer up items to get items, if you do favors for the specific Nomadic tribes they won't Markup their wares quite as much. You have Arm/Chest/Head/Unavailable item pieces that influence your combat skills and abilities, they usually have a main ability and a "charge" ability. Changing them can change the gameplay rather drastically. For instance there are pairs of claws that act more like AoE hitting a wider field in front of you, you can switch them against high-impact point claws or ranged ones you can shoot things with. The chest slot usually has some sort of shield ability (whether one-hit or specific amount of damage) and something else, for instance you can lay exploding mines or similar), but there's also chest-pieces that can make you invisible or similar. The head slot seems to be for Evasion and kiting. Along with three items that falls into the throwable/healing/bombs category and shit like Runes to increase Skills like Barter or general combat stuff Damage, Armor, Shield, HP, Critical etc. and you can Upgrade your internal Organs by crafting better ones from parts you find off slain enemies (the only player character in the Demo so far is some sort of Void Lich).
The gameplay itself might not exactly be the best I've seen in all ARPGs, but the interesting lore, design and other elements kind of make up for it - while some ARPGs get boring because 97% is just clicking things dead there's a lot of other things to do here and the Quests seem varied enough, at least so far.
The Demo is relatively long (like 6-7 hours, the complete First Chapter), you should at least give this a try if you enjoy RPGs.
For Adventure Games fans, gonna be trying these soon, especially the first
seems Monkey Island-y:
Conquistadors vs. Samurai? From the Trailer at least it seems kinda interesting (although there's no Demo), seems to be an MMO though:
for obvious reasons, or 
since it seems like unabashed straight male fantasy stuff that annoys the right kind of people.
