Very cute game and art style.
The gameplay is very responsive as well. Though, I didn't realize the "rock" that I push is charcoal, and that I have to press the action button to burn it.
Water that kills you when you get near is nice conceptually, but I think there should at least be an indicator of a danger zone. Maybe a different coloured tile around the water would do.
I really like the twist in the middle of the game. I felt like a murderer at the end.
I like the SFX, even though a simple music would help as well.