I’m making a 2D platformer (How do you make a Ball or Sprite 'jump'?)

[SteveJG]

@Darth8274

making a solid object on my test area for the player to jump on

One way would be to place the 'solid' object as the background to the Canvas. Not really solid but the techniques in Creating Animated Apps can be used to make the pixels associated with the object behave like one. Additionally, you can check the pixel color of an area of the Canvas to determine whether a ball or a sprite attempts to land on or cross the boundary. A maze would be one application... have you checked the MIT Gallery for examples Find the Gold Maze App - Challenge Part

These examples may give you inspiration:

https://imagnity.com/android/flappy-copter-create-a-game-like-flappy-bird-from-scratch-using-app-inventor/

and

Oh My Spikes – Create a game from scratch using App Inventor | imagnity

@Darth8274

want another one the player can move but make them both solid objects

Do not understand.