I know that there is a similar update coming soon, but I wanted to post about my idea

Level 2: Bundle
Levels 3/4/5: One hat for each level
Levels 6-9: One hat for each level+ 100 credits for each level
Level 10: Crate (5 possible items)
Levels 11-14: One hat for each level+ 200 credits for each level
Level 15: Astro
Levels 16-19: One hat+500 credits per level
Level 20: Astro+
Levels 21-24: Hat+1k creds per level
Level 25: Lifetime membership