You have a good foundation for a cool story driven game here! However, I think it could use some more work in the narrative and the scene is too big for the character. Either make the character move faster/implement a sprint or make the level shorter so the player doesn't have to walk long distances to its destination.
I like that you don't guide the player and tell him what to do, I love when games let you figure things out. The brief explanation at the start is a good hint to tell you what is your purpose and what you must do. However, I feel like the grave and putting the crystals there should be a little clearer. I got lucky getting in the grave place at the start because I instantly saw the slots and thought it had something to do with the objective but I feel like this can be easily missed by other players.
I have to admit, the classic trolly problem didn't captivate me but it could be easily fixed with a nice narrative behind it to give it more character.
The visuals are great, I liked the environment, the fog, the snow, the mountains and the textures were all great! But there seems to be a performance issue at the last room with all the candles. My framerate dropped a lot there. Maybe it has to do with the extreme amount of lights and objects casting shadows there? Other than that, great graphics and scenario, really enjoyed it! It's a shame the level is too big for navigation.
Overall, I think you've got a promising game here! Don't let the critics I gave here demotivate you and don't see them as negative things, but see them as improvements you can make towards new versions or more projects you eventually make! After all, making a game in just 4/5 days is an extremely challenging task. This game is still enjoyable and it plays well for the most part so congratulations on finishing it and for the submission!
Would really appreciate if you could rate and give feedback to our game as well! Thank you!