Nice short game!
I think the game could be played faster if opening chests and unlocking gates could be done simply by touching them instead.
I like the press A to open chests and doors. It is more immersive to me than walking up to them as pressing A mirrors opening a chest or turning a handle. From memory, you can set the grid size to 16 pixels instead of 8 in the settings for top down scenes which will assist in maneuvering the player character during play. That way, the mole will line up with the puzzle elements at all times during movement, making the interactions slightly more clear. A second improvement would be to make sure the puzzle elements (snakes and key chests etc.) Have a black outline around them. That way they stand out more which is beneficial for readability. Really excellent work all the same. Well done!