I'm glad to read to your comment!
I started making this game over a year ago. It was born from the feeling of a person who loves staying at home even in normal times.
I understood from several comment that my game is difficult. Because of strength of enemy, way of control are difficult to understand. I has an idea to improve to this problem and I will try.
And translation problem annoy my head. This is the limit of my current English ability (in spite of Google Translation is already used, and I have one collaborator's advice), so I have to get someone's help or more good translation tool, more study English ...? I think that I want to anyway improvement.