Click the bee and use upgrades to increase your score. Watch out for the gold bee and it will increase your score by 50%.
Thanks to @Electricbulb_ for visual effects Rebirthing gets you a new costume up till Rebirth 8 0. Normal 1. Blue/Red 2. Green/Yellow 3. Pink/Purple 4. Rainbow 5. Retro 6. Gold 7. King 8. Rainbow King
