2.5D Game, move only in 2 axis

First of all, sorry if this post doesnt belong here
Im trying to make a plataforma Game in a 3D world and with 3Dmodels, but you only can move horizontal and vertical, and with a 2.5D view

The problem its that if the model of the plarform or something is not flat on the z axis (where you wont move) the character can slide
Any tips? Thanks

 

You're in the right place.

But how are you controlling your character? And what do you mean by "slide"? Perhaps a screen shot or two would help explain what you mean.

 

Im prototyping the levels with standard assets, and moving with Ethan just for testing, i Will change it for my controllers.

With sliding i mean if you only can move in z and y axis if one obstacle is like a sphere you can slide into x axis, and you can move back yo the original position because the controllers only allow you to move in that 2 axis