When the player moves upwards then falls down onto what should be a platform the player dies, this made the level essentially impossible. Sometimes block collisions seem to be non-existent. Movement feels like it has a delay on it, makes navigation unnecessarily difficult. The enemies move behind the green blocks leaving the player to figure out where they are based on a pixel or two below the blocks.
The way you used the graphics was nice, the sight motion on the characters also made them feel a lot better.
Overall if the controls were tighter and more responsive the game would be much better, still a good attempt though 😊