Wow - thank you 
Moonstar!
It's easy to create nice games with your asset.
I'm working on the second level and add some new elements (spikes, breakable walls, ...)
With the second level the Knight proceeds down the dungon and it's getting hotter (a lava pit?!)
Here's the music loop for the second level: track level 2
And this is the editor view of the game:
tech talk: the levels are set as tilemaps, the goods where replaced at levelstart with single objects. The enemies (and minor elements) are playced as objects directly.
This way creating a level is technical easy - and i can focus on the level design.