You can if they have the solid behavior but how are you using more than one platformer object in your game?
If you have more than one platformer they will all respond to movement controls?
Your questions asked how to bounce solids. Solids are not a platformer with movement behaviors but platformers can also be solids.
So I would have to see your capx to see what you are doing?
yes, I've attached capx with starter message, but I'll repeat it here: dropbox.com/s/v2x6iux376h3m75/scetch.capx
So, I have 1 platformer object as a player with non default controls, and another platformer object as enemy that is controlled by events.