This game is designed to emulate the original Super Mario Bros in play style as much as possible.
Spin jumping? Who needs it. Backtracking in a level? Bah we need to keep going forward. Saving? Only scrubs need to save Level count? 8 Worlds 4 Levels each is all you need. Warp zones? Jump over the world of course. Map Screen? You won't even miss it. Lives? You earn them.