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You can make your colision effects 2 ⅓ D like this

What is 2 ⅓ D?
2 ⅓ D is where your cahracter doesn't colide with the ground at the very first pixel
Heres an example of what I mean. You can turn this:

into this:


Here's how:
First, make your level (You can use 1 large image if you want to by using a tile editor called TileStudio), then make your INVISGROUND tiles that follow along with your level. This will act as the real ground, while your level is just a background so to say.

After you've traced your level, do this with the INVISLAND


Here's an example of how it would look inside of the editor

Nice!

Thanks

I'm busy with something similar at the moment. In my game you can walk up and down the platform. It's a little bit more complicated because of that. I used a Z-variable and when my character hit the platform it calculates where it should land.
Controls: WASD + Spacebar.