Hello, I can't do this working and Idk why. For the tinyTVjam I'm making a tiny pinball and I'm trying to get the ball going up, but doesn't respond.
I try everything but the ball still going down.

ball.y+=ball.vely
ball.y+=ball.grav

--this for tests--
if ball.y>=5 then
  ball.vely*=-1
end

That's not a lot to go on. But, I'd expect to see gravity affecting the y velocity, not the y position. Maybe something like:

ball.vely+=ball.grav
ball.y+=ball.vely

Thank you! that did the trick!