Help me improve my game

Hello, my game is currently quite good but it feels like i need to add something to it. Can anyone give me a suggestion?!!?!!?!?!??!?!?!?!?!??!?!

Link to my game:
http://www.flowlab.io/game/play/243949

nice ideia but needs to evolve the sprites like more “Light” or “Simple”

In other words instead of 16x16 pixels use 32x32