The game looks really good, Retro-Guy. Unfortunately, I am only really fluent in English - in the future if you could make an English version, that would be great.
And this is not a criticism, just two little art things I noticed

Did you use the Ben Jordan sprite for a base image for John Sinclair? If you did, you obviously did a lot more with it and made it your own, so good job!

Did you use the falling man logo from Myst for the falling man silhouette in that image? I think I might be the only one who notices this

Anyways, if you can get an English version up at any point, I'd love to try out the game!