I say, add more prizes you claim from the rewards in gift key.. here's my idea.

Level 5- 2500 credits
Level 7- Normal Item Box
Level 10- 1000 Power Kit
Level 13- 15000 Credits
Level 16- Golden Item Box

Is this good? Or it's good the way it is. Have an opinion? Send a feedback!

If you ask me, the only reason to do it is for the gold box. I would lobby for a second gold box at level 30 though. This is a pretty significant accomplishment and probably represents the addition of a long-term player to the game.

To me, the small amount of SM that you get from the other milestones are relatively inconsequential.

Well! I Like That Idea That's Nice I Think One No Need Normal And 2,500 SM FOR THAT Silver Item Box