So i have now played all the prototypes...
Hack n' Slash: Not a huge fan of this game. The pitch was good but it feels like there is a lack of things to do from what they talked about: "hack" the game so to speak..
Spacebase DF-9: The potential is there abit buggy (prototype) so thats not a shock. But it is overall fun and if they added more things, events, encounters, depth to the game it could be great!
The white birch: The camera makes me want to kill myself :( but beside that its overall nicely done but it could use more "ways / encounters / puzzles".
Autonomous: Same as with DF-9 the potential is there. Abit easy once you have a few bots running around. More depth, options, less invisible walls, add hidden things and so on and a inventory system / co-op / multiplayer and so on.
Black Lake: I found the art very interesting that they pitched but i found the ingame art style lacking sadly. While it was interesting there was also a lack of "things" to do. You follow the line. Sure you could go off the beaten path but within the prototype there is no reason to do so.
Anyway overall it was nice =)