I manage to play your game and it reminds me a little of Super Mario Bros. 2 meets Kirby. I have a few suggestions to make the game different from past platform to make it stand out. Create a scenario of collecting 50 fruit or vegetable to unlock a key to the next stage with a time limit of 2 to 3 minutes to create the stakes. As for the fruit or vegetable create a different fruit for each stage like an apple, orange , potato, etc.. Also have the player the ability to land on the enemy's head as platform without killing it if the enemy does not have spike or helmet on its head, and double tap the space bar to stomp and defeat the enemy.
I hope these suggestions would help polish you game to which its looks promising.