Hi,
just wanted to share my work (Construct 3 runtime) : template for platform games, with multiple layouts (player can go foreground or background without collide with the other layouts), with collectables on each layouts, like the Little Big Planet game. Enemies will work the same as collectable, and you can add stuff like hooking on walls and other stuffs like L.B.P. ( Maybe in an update :-) )
All commented. You can see a video here :
Bonus : a working start menu (simple)
On sale on Scirra Store : https://www.scirra.com/store/royalty-free-game-templates/lbp-like-platformer-2d-5603