Hey, thank you for purchasing Battle Splash. It seems to be a known issues with the game, so you'll have two options to prevent that:
1. Play the game in DX9: When you press Play in the game Library, select "Play Battle Splash in DX9", and the problem will go away. This is for old graphic cards as well as preventing many graphic issues.
2. Turn off Eye Adaptation: When you launch the game (normally), go to Options->Video, and then turn off Eye Adaptation.
Hope these helps :D