Like Gruftsocke below, I played for a long time trying to find Tim. And others have mentioned the transparency issues with plants/webs etc. The walkie talkie loop gets really annoying, I would just do some seconds of soft static, then interspersed every once in a while with static Tim voice. Also, your sound attenuation goes into the second floor, I would lower the collider so you don't hear it upstairs.
Having said all that, very ambitious! You got a whole story with cut scenes in on a very short schedule, congratulations! Would love to see it if you clean it up a bit!