The story is something that was the main focus in the game, and this made me feel somewhat frustrated with not knowing what happened after the flower was found. I felt that there was a lot to be told (based on the others scenes to come), but there was not enough time to do so. In this case, an ending drawing would be more than enough to finish the experience and wrap the great story created.
The lock picking is an interesting feature that could be more explored, one option would be having the code hidden in a drawer, a letter or even in the painting on the wall, those types of puzzles are fun to solve and add more depth to the gameplay.
I agree with squid.mid's comment with the player walk speed, having a way to switch between walk and sprint would solve this, so you can have more movement control when trying to reach certain objects.
The art is truly beautiful, we can see the sprites and every place created has love in it, great job!