Hi! Oh OMG, I'm amazed you accomplished all this in just three days! You even have audio voice-over, not just text dialogue! There's a tutorial. It looks really great.
I think you should make it a bit brighter, but that's just a subjective feeling—it seems a little too dark. After breaking the wall, I couldn't figure out the path to get the key from the gold. It's clear that it must be possible somehow. Maybe adding a subtle hint/arrow pointing somewhere would help, but that's a minor point.
I also ran into an issue: when I play fullscreen, the UI doesn't fully display on my resolution.