Oh man, I really really really like the atmosphere and sound design on the first area. For me it has a LOT of potential, even with the tank controls and the fixed camera. But when I reached the base, I became a little dissapointed when I discovered it's a run from the monster game. Nothing wrong with that, but I think it has a lot of potential to be just another run from monster game. The level design of the base is way too confusing, and that's critical in a game like this. Please check out the Resident Evil 2 remake, you usually don't get lost when the Tyrant is chasing you because of the great level design. Every room has personality and you can make a mental map of them.
Please don't take this as an attack or something, like I said, I really liked the experience, and I take my time to write this because I think your game has A LOT OF POTENTIAL. The atmosphere/mood is very very great, and the sound design is good too. I think it can be one of those special games that comes only every 5-10 years (like ICO, Limbo, Inside). Congratulations, and I'm eager to see how this evolves. Off course, if you want me to give you some feedback or playtest please let me know.