***SPOILERS DON'T READ UNLESS YOU'VE PLAYED ALREADY***
The visual and audio assets you pulled together meshed really well to make a mysterious riddling atmosphere for your game. I really enjoyed it!
I liked the concept of the game a lot, but was a little sad it wasn't more complex. I answered all four riddles because I wanted to experience all the content you had (and I liked all of them btw), but three out of the four riddles given (as hints, not the initial questions) by themselves made the answer to the two doors problem pretty obvious. I was hoping for the four hints to tie together somehow, where only when you had all four could you be absolutely certain which door was correct. Just as a thought experiment, instead of each hint pointing at the correct door, you could have one hint that describes attributes of one of the doors, while another tells a story of someone going to that door or something which hints where it is, etc...
Take what I'm saying with a grain of salt because this is ultimately your game and you can design it how you want :), I just really love riddles, mysteries, and puzzle games :P.
I think this was a great game, and an even better first game! Congrats :D