Good job! I think the game would be a lot more interesting if there was more positive feedback when you speed up and the outcome of the game was more varied. By giving player a wider range of outcome they feel that they are learning and improving their skills. 

It would be great to provide 'Return' buttons, so the user doesn't have to close your game every time. Also, another improvement for your game may be description. It's unclear that a player has to avoid wave.

Sometimes, when a player picks up a target, the game ends.

It is hard to understand the purpose of 'Options' scene. Player can see a scroll, but it is not said what it is for.

Interesting idea with the taking shelter from the rain of objects
The ball pulsing makes it a bit too difficult though
minimap and snow particle effects are cool