The game found can't reach the final secret level

In the game, each 5 level you can find a secret key which can unlock secret level (level 26 to 29). Theoretically it should have level 30 and the key to unlock it in level 15, but in level 15 there is something in the sky but I can't reach it although I tried my best.

I edited the save data to play level 30 directly found this level is existed ( level 31 and higher are empty ), in this level there is a kind of block that can move when you stand on it. Which means that in level 15 may somewhere has this kind of block leads the player to the sky.

A streamer in China bought this phone and found that the game version in the phone is different than the game you found. In the phone, game's version is 1.06 while you found's is 1.0. He successfully found the key in level 15 and reached the level 30. Maybe the game you found has some bug and it was fixed in next version?

Chinese Streamer's video:https://www.acfun.cn/v/ac26927617

And he posted the longplay from level 1 to level 30:https://www.acfun.cn/v/ac26982808