Wow, awesome! I love the Alfie and squirrel art, and it’s clever how the bushes are slightly disguised as background elements so you have to pay attention to make sure you don’t anger any squirrels!
If you want to keep expanding on the game, some natural extensions might be enemies with different behaviors–a cat that walks back and forth on a specific platform (like the fireballs but horizontal!), or poison ivy that springs up from the grass after you walk over it, or pigeons that shoot projectiles at Alfie.
Another angle might be to add power-ups or items for the player to grab. Something that enables a double jump, or a brief invincibility spell, or an extra life! “Power-ups” might even be mostly aesthetic, so grabbing an item might give Alfie a fancy collar, or a hat or something.
Excited to see what you come up with next!