but what are the trademarked character in the game? (sorry for my terrible english)
thanks again for your good advice.
You're using at least one trademarked character
The buttons on the start screen are very small and there's not much else going on there. Why not make them bigger to fill up some of that space and make them easier to touch?
The yellow text on the start screen is hard to read. You may want to outline it in black.
You're using at least one trademarked character in a game that's making a profit from ads. You could get sued really hard for that. You should probably change it ASAP.
The ads cover a vital part of the play area. You may want to move the cauldron up so that it's above the ads and the player can see it clearly.
Touch control would probably be a better option here. Tilting the screen is hard to control with because you have to tilt your head to keep seeing what's going on.
I have no idea what's going on here. The black potions are bad, the purple potions and letters are good. There's random characters flying back and forth that don't seem to do anything. There's fairy princesses falling from the sky that stack up on the bottom of the screen until I tilt the phone sideways and wait for them to fall off the screen. Am I supposed to just keep catching potions and letters until I die? There's not a lot of replay value in that. Maybe if you used more letters than just A and B and let the player catch letters to try and spell out words or something? Maybe some power-ups of some sort would help? (A lightning bolt that the player can use to shoot the witch or something?) It just seems like catching 3 out of 4 things falling from the sky isn't going to hold attention for very long.
I think just adding more content or sprucing up what you've got there will help a lot. Animate your sprites, think up more features, etc.