Short but sweet mini puzzle game, reminds me of an escape room mobile game I used to play haha! I like how the theme is used as the framing of the puzzle to unlock the key, the art work is kinda cute as well. I like that the door has a sound effect, but would've liked if there was some music to it as well.
You have a pretty good set up for a potential game play loop of solving puzzles to unlock doors, which could be interesting to explore.
Good effort! : )