Is your slope collision being done with a sprite object or the tilemap?
If it's a sprite, is the collision poly sloped so that the sprite sits at angle 0? Or is it a box collision poly and you're rotating the sprite itself?
Depending on how you're doing your slope, it will affect how to go about programming it.
I'm using a tilemap, The slope tile has 3 polygon points forming a 45-degree angle. Thanks for your help!