Yeeep, I can feel your pain... 
The boss appears at the end of level 19. He is quite tough. If you haven't invested hearts into upgrading skills it will be very difficult to defeat him. Boosting your defense against enemies might save you. Focus on defending against flies and the troll and click on the boss when he opens his mouth.
The old demo was quite repetitive and difficult. Now we changed the gameplay to more varied and shorter. The new demo will be released this spring ;)

Hi! We're planning to update the demo this spring. The full game will be released this year.

没有，但如果我们能在游戏发布前找到翻译，我们计划加入中文语言。

Thanks! XD
Full release in 2025

Hmm... Maybe you trying to uncompress android version? PC version must unzip with 7z.

Thanks! :D
Full release will be in 2025.

Yes, the full version will have more minigames and various activities. Thank you! :)

Hello! Thank you, we will fix this problem in full version. You should exit game and run it again. This happens if you click on the minigame icon when the girl starts to leave -_-