Needs improvements.
It's not bad, I think it would be really interesting to see you work on this more.
A few suggestions:
• Mario still falls halfway through the floor
• Add a squashed animation when you step on goombas, as well as the Koopas.
• Coins are useless. Why did I collect them all?
• When you jump, Mario goes halfway through the blocks above his head
• Add longer levels, instead of page flipping, why not use scrolling?
• What's a Mario Game without the Mushroom?
• The boss does nothing. Just walks back and forth. Add some depth to the boss.
Just some ideas :)
--Hank