pretty cool game! some things i would change would be
1.Change the aspect ratio of the game. the html window is too big compared to the game so some of the sprites are stretched and look distorted.
2. The game just repeats over and over, not sure if i'm missing something but i would add a proper end if there is only two rooms.
3. The gems don't make sense to me. Add a short tutorial or a way to explain using the game.
Other than great submission ^-^