The death sentence is still on the table but I did it. Mostly by chance, there's no way I'd map this (at least now that I managed to win once :) ), I wonder if letting the line forever is not better. Otherwise enemies not moving probably is the only thing which prevents the game to feel fully complete, but I already said it plays very well, it's a pretty good work.
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The compass is actually an objective marker but I didn't think to mention that in the tutorial until after submission. The cube is procedurally generated each time you spawn, so that could result in a tragedy for cartographers too.
Another fun bit of trivia about the objective marker is that it wastes around 30% of your framerate. Thanks for making it to the end.