Wow! Thank you very much for providing an English translation!
The story of how your son created the name of the game was nice to read. I was thinking of the name Doom-Hulk because technically Doom already takes place in space.
Doom-Hulk may be more enjoyable with additional Doom dice sets that can be purchased from the Fantasy Flight Games Web site.
People get kidnapped by aliens. You are a farmer. You need to save the people.
You need to keep maintaining a healthy supply of cows with the resources you have to attract the aliens (because everybody knows aliens like to kidnap cows). For this, you need food for the cows, fences, fields and crops (because it is also well-known that crops are alien landing pads).
When you attract aliens, you take your farmer shotgun and board the alien vessel to rescue the people you can. Of course, it just *happens* that the people you find and save are actually females. Some will have been experimented on... parts of their body will have been placed in jars and you have to recombine their various *ahem* parts using an alien device before you can save them.
And when you save the kidnapped girls, you will probably have kids coming to live with you as a result that will require food/clothes/etc. You will need money to sustain this huge family (and the ammos and guns you will need). If you can't, you'll need to beg and will lose points in the long run.
The player who has the biggest pen, number of cows, food, crops, the less unused space in his farm, the less amount of begging time and that has the biggest number of kids and saved girls wins the game.
There you go... Agricola, SpaceHulk/Doom/Space Crusade and Busen Memo all mixed into a single game.