Tutorial is in. Preparing for sharing

Lots of last minute fixes to get ready to make the game public for now and send it to some friends. If you say no to the initial prompts you can be completely offline and the UI appropriately doesn't show leaderboards except your own local score. That took a lot! Finally removed all the last traces of the pixel graphic UI elements. Lots of little polish things. I think I am done for now. I will let people check it out and maybe fix some bugs. No ways of monetization for now. I should probably add a way to generate powerups based on doing a good chain or something.