I loved this game, it started out as STALKER-like indie effort with no clear direction (was it an RPG, was it an FPS, was it a base builder, etc) and after having finished it I must say it's its own thing, an interesting mix of all those elements that ended up being executed better than I thought. I especially loved the complex decision tree and how they impact each other, quite similar to some of the best RPGs. The early game is rough but the midgame is great (basically once you get good weapons and don't struggle for resources and food anymore you're in midgame).
The levels are amazingly well crafted, I kept wanting to go back, kept using the photo mode to take screenshots.
The timed mission thing was stressful until I realized what happens when it expires... Suffice to say it actually makes sense in the game story/lore and you have a way to deal with it and continue playing the mission so not a big deal. I also think that without a bit of pressure from the mission timer the game would quickly become repetitive because while it has very detailed levels there are just a few of them so it can easily get repetitive if you can spend hours in each the first time you go into them. But don't despair: there will be tons of missions taking you back to the same level over and over again so plenty of time to explore and learn the levels by heart even without attempting to reset the mission timer (which you can do).
Looking forward to see what else these devs will be making because if this is their first game I'm very impressed!