One person makes this game, and the same person reads every message.
Write to dev@yumetower.com. English or Japanese are both fine. Replies usually come within a few days; a little longer around a release.
The more of this you can include, the faster it gets fixed:
Crash reports reach Apple only if you have chosen to share analytics with developers in your device settings; they never include your tower.
Yume Tower has a single one-time purchase that unlocks the full game. If you have bought it and the game still shows the free limits, open Settings and tap Restore purchases while signed in to the Apple account you bought it with. One purchase covers both iPad and Mac.
Purchases are handled by Apple, so refunds are too: use reportaproblem.apple.com. We cannot issue refunds ourselves.
Your towers are saved on the device you built them on, automatically as you play, and in named save slots from the in-game Settings. They do not sync between devices, and we have no copy of them. Deleting the app deletes the saves with it.
Platforms, pricing, languages and the rest are in the FAQ. How we handle data (we do not collect any) is in the privacy policy.