Ok ngl, it was fun to solve the puzzles even if i hate maths/science, the switching between times, loved this concept too. Other than that, FOR UR FIRST HORROR GAME, this was a blast man!!
Keep up the good work, the only feedback i wanna add would be to include background atmospheric/ambience/ music/sounds etc.
And the more you will create, the more you will learn n grow along the way. Its not like every game needs to include ALL/EVERYTHING either. So you're starting great! Keep it up!!