Hi yyz i thought about your game a bit and i had an idea for getting better in the game when playing.
The idea is:
Maybe make a chest system in where you can get pets, bridge styles, and airplanes if you actually going with it with and money to upgrade those things and in each game the player plays he will be able to use one of those things he got out of the chest.
Achievements:
You can also do so when you do something spacial based on how spacial or hard to do it you can get a chest in a different level.
Design:
You can make the chests in the shape of a card like those inside of the game it self.