It appears that you have uploaded your entire unity project instead of the built version of it. I can open it with my personal unity but can not open the game alone to play it. I would suggest you look into Unity's webGL tool to allow your game to be played in the browser. I played the game in the unity editor and it looked really nice! Similar to the binding of Issac with many unlockable characters. Overall great game just needs to be more easily playable.