Simplest way is add "solid" behavior for your " player", If enemy is a platform object, they can not pass when touching player.

Sine, and face maybe rotate behavior may cause the FPS down, as i can see here, the Sine behavior is the most cause down FPS. Check the " space blaster" in "example" folder, try to test it using cocoonjs, friend.

Check "project setting" and looking for "use loader layout" set it to "No".

If use loader layout set to "yes" , it's mean your project load the first layout and script, start the game and continuous loading another layout, it's reason FPS drop for a few second. If user layout set to "no", the whole project will be loaded and start game.

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Have you read the performance tips ?

https://www.scirra.com/manual/134/performance-tips

Could you tell me what kind of game you make ?? I have a lot of experience in creat a platformer game for mobile using cocoonjs.

why don't you use behavior called "pin"

You can check the distance between Player and nearest enemy, when nearest enemy going near player, just creat some blank solid object and pin it to enemy everytick. And when enemy too faraway from player, destroy the blank solid.

I know there're a lot of way to do it.

I remember Ashley talk about multiplay and it's in his todo list, but 3d is too complex, who care about 3d :))

Cocoonjs and appmobi still is the best choice at the moment .

i'm have a same problem, the animation often skiped, and play 2 frame/10, my project is quite huge, it's not happened since r105-106, i can't post capx in here.

:)) everythings seem so pro !! keep up your good game —

It'll will be soon, i'm sure :D