Left and right arrow keys to move, up arrow to jump, touch the things that come out of the tubes to catch them, press X to throw them. Have fun! PS: is possible. I don't know why this took so long to make, I was just confused on how to program wart, I guess. If you like this then you should check out my SNES Super Mario Bros The Lost Levels remake :D
I know you don't like to wait for a final version so the demo is the final boss. Music is from @GamedawgVGM and sprites and level maps are from mariouniverse.com. Just beat final boss today as well as the game. If I had to beat it on a smaller screen on my 2ds, you have to too! (also I can't get the screen any bigger) Like in the real game hit wart 6 times to win.