Arrow keys to move. Up arrow to jump. You can stomp on Glomps (angry yellow blobs with leaves), Fliers (large flying things that look like insects with no legs and tiny wings), and flying squids. Don't touch flaming spikes, angry cacti, saws, or "Circular Booms" (green circles with red stripes that will follow you). Tornadoes will launch you high up. Don't fall down bottomless pits. ALL LEVELS AND BOSSES ARE POSSIBLE!!!!!!!!!!!!!! TO BEAT BOSS 1: Jump on the green balls launched by the boss to damage it. This will need to be done 7 times. Don't touch the spike balls launched by the boss, because if you get hit once, you will get sent back to the previous level. TO BEAT BOSS 2: Jump on its core (the blue, orange and black spherical object). This will need to be done 6 times. After you jump on it, it will be temporarily invincible. Don't touch the fish shurikens, plant drills, or spike balls the boss will launch at you, because if you get hit once, you will get sent back to the previous level.
All the credits are in game, but thanks to Nintendo for the music and sound effects, and thanks to @griffpatch for the platformer engine. I got the music https://downloads.khinsider.com/ I got the sound effects from https://themushroomkingdom.net/wav.shtml