Use the side arrows to move out of the Goomba's Path (and watch out for Bowser and Bowser jr.!) if you touch a 1up you get another life if you touch a super star you become invincible to goombas (not bowser and bowser jr.)
If you want to draw with pixels like i did with my backdrop I recommend https://www.pixilart.com/ please tell me about the game and report glitches thanks! :) can you beat the high score?