hey this little game ruled! I'm new to Godot and I was able to figure some basic things out looking at your minimalist code that I couldn't from more complicated demos and fancy tutorials and online courses. the print functions made it easy to understand playing in the editor.
it was fun, too! I actually beat it (although I did change the Lose function to not kick you back a level, because that's just mean).
anyway, very cool little minimalist platformer!