Congratulations completing the game in a week, especially as a solo dev, and using Unreal. That's an accomplishment to be proud of.
I like the graphics for the game and wandering around the main character's house. With the puzzles, I think I may have cheated. They were very hard to solve initially, until I learned the pattern and was able to keep the character's phone off while completing the tasks; the composure bar (which you misspelled) does not go down if you never turn your phone on. It took many tries to figure out that batteries were a thing, which had me wondering for a while whether the game is solvable.
Your game title, "Lonely," along with some description of the game, seem to promise something that I do not believe the game delivers: a more moody experience where we explore loneliness and frustration. Maybe there's something philosophical in that when you're lonely you solve problems in the dark because you decide you just don't need light (I can see that), until you see light and for some reason that sets something off in you. I was kind of hoping to see the game lean more into what your title seemed to be suggesting. But I did like the game.