Thanks! We had no time to implement a proper tutorial but will do so in a post jam version, where the shuriken was replaced by another weapon with different, more readable behaviour but with the same outcome. 

Hey! That's an unfortunate bug that we didn't have time to fix it. Only way is to reload and don't die on that level :P. 

We will release a version with several bug fixes and better explanation of the mechanics later 

You need to press S at the start and at the end of the level, so you can create the path of the shuriken.