2D Platformer Tutorial

The changes I would like to make:

1. I would like to remake the movement system to allow the player to use a jetpack to jump rather than normal jumps, as well as some kind of dodge or roll

2. I would like to create weapons for the player, such as a pistol or a knife as the players main way to fight enemies

3. I would like to make a metroid style level, a level with multiple locked areas that require various different abilities and keys to progress through the level