Each level has its own assignments, so you have to eliminate 15 tomatoes and 15 berries in level 2 to reach the level. You can use the boosters that you have earned before you begin a level. For example, you have a booster to exchange fruit or other handy boosters.
If you play every day you get a daily bonus, this bonus increases every day that you play the game. For example, you receive 200 extra coins on day 1, a gift on day 2, a larger gift on day 3, and so on. Until day 7 where you get multiple gifts.