It's a very good tribute to the 1985 Super Mario Bros. The music is cool, but is only one and don't vary, and can be boring hear the same thing every time everywhere. The pipe thing is useful, and the shop thing is really cool, however I think a HUD showing how many coins you have would be very useful, since you need go there every time to see if you have enough coins to buy the item, and some people (like me) is too lazy to count each coin we get.
The game looks to have a good gameplay and visual, and that's cool. However there's some pits you need fall in, and one of the Super Mario Bros. rules is that if there's a pit on the ground, it leads you to death.
3.5 stars for the effort put on this project. Good job!