Hey glad you enjoyed it :)
Without spoiling too much, the sounds you can hear are produced by the test subjects. They each have their own motive. Some want to escape. Some want revenge on the lab technicians that did this to them. And some don't understand what's happening but instead their memories are leaking through. The main character's identity will be revealed in the full game... vaguely.
And yep, you're right. The gameplay is a little too resident evil at the moment. I have LOTS of ideas for mechanics I want to add so watch this space for updates. Thanks for the feedback!