Preview, eh?
I found the music to be a little fast tempoed for the speed of the game. Better music might have been a better choice and used this one for something else.
If this is a preview, then I hope to see some Fire-power later on. What could Mario be "summoning"? Maybe rename it to power-up unless you actually intend to have mario calling up Espers and Aeons.
Not sure what you have planned, so I won't try and tell you how to create your game.