Soo, i could travel throughout Germany and Denmark for quite cheap?

Kind of, but you'll have to take the scenic route (long distance trains IC/EC/ICE are not included).

If you’re not in a hurry - it is not valid for the high-speed (ICE) and mid-speed (IC) trains in Germany.

In Germany, only in regional (slow) traffic (the RE only goes between 100 and max 200 kmh)

Interesting. Do you have a link with more info?

So like 40€ for 8 consecutive days. That greatly reduces usefulness if you just want to travel to one spot and back.