it's just a so called: 'Early Access' so yeah you get as much stuff as possible and do as much Damage til you beat him or die starting all over again. press attack button then it will give you options to use 1, 2, or 3. if you type 'back' you can choose a different move in case you're stuck or just press any button.
it's like a combination of NES (Character Model) and N64 (Stage)