Terranigma 2.5D SNES Style Jumping

Hey there,

I've been building a 2.5D SNES Style game, which uses pixelart Sprites an a 3/4 view. As physics i use
2D-Physics and movement via ridgidbody2D on the X and Y axis.
Now i tried to implement a jumpsystem in my game, but i don´t really know if it´s possible to jump in 2D, when i use the Y axis for movement. The gravityscale is set to 0, so the character isn´t falling "down".

I tried to change the gravityscale back to 1, when you hit the spacebar, and then i added a force to the ridgidbody2D of the character. After the jump i set back the gravityscale to 0.
The result is, that the character is falling a bit down and then stops or he is move up, but never comes back down again.

My question is, is it possible to make it in 2D or should i convert to 3D and use the X and Z axis for movement and the Y for jumping?

I´ve added the scripts as attachment.

 

You can change the direction of the gravity in the Physics2DSettings. It can only be set in the X and Y direction. I'm not sure how your world looks, and if you need to use the Z as well. You might be able to get around these limitations by rotating your world to fit the useful axises.