Arrow keys to move and change attack direction. Z to jump (and double jump). C to dash. (Note: You may only dash one time in midair before landing.)
Part of the reason that I wanted to make this was because I noticed that a lot of platformer-type games on Scratch are really hard to control, because their character's momentum is crazy. Each frame allows the player to change the velocity rather than directly influence the player's position, and if the change in velocity is large enough, that's fine, but I keep seeing games where the character is ridiculously hard to control. While some games (including some platformers) can benefit from this, I feel like it can tend to take away from the player's experience if not carefully done. Credits to Hollow Knight by Team Cherry, as it uses the control scheme I went with. It's a great game, and I honestly recommend it. I may or may not end up expanding on this in the future.