Video walkthrough of all levels.
Make sure to save every opportunity you have, because failure causes a game over.
After the last battle, watch through all of the credits, the final achievement will be awarded when you return to the menu.

https://www.youtube.com/watch?v=vTI25obiG6g

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https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2880052179