When I first started this activity, I was dissapointed, becouse of controls, which is bad as ♥♥♥♥, you can just run in wall, and keep running in it.
Or most of the time, you cant control your character.
Another thing is that it looks like some mobile game ♥♥♥♥.
And another one was that I couldnt do it on gold, becouse of that controls.

I find out its pretty ez after 5 hours of trying.
If you want it on gold you need to take most of orbs to get burst.
If you have burst, wait for that stopping walls to appear.
Then activate burst, and smash all of that walls, becouse I find out, that when you break the blue walls in burst, (burst activate blue walls) you get points for that.
Plus when you try to destroy the bike allien, you will get another points.

With destroying walls, its super ez, and you will get bronz in like 20 seconds.
So I hope this guide helped, becouse i hated this activity mission.
Give like, and go try it.