Very nice pixel art, I love the art!
The concept seems very interesting, however I did not manage to understand how to play, despite several restarts and having read carefully the description. As already mentioned by others, some onboarding in game is probably necessary.
Maybe you can explain to me how to attack ? In the description it is written that it is automatic, however I have the feeling that my character never attacked anything or anyone and each run ended-up with me running around in a desperate attempts to trigger something and being kill after a while.
The "camp" level where you can press on the blacksmith and the portal could be improved a bit UX wise, at start I didn't understand what I was supposed to do and by clicking randomly I managed to open the blacksmith ui and press on the portail but other elements seemed to do nothing. Maybe those should be redesigned with better affordance in mind to make it clear what can be interacted with and what can't.
Audio is simple but effective, good job on that.
Overall I think the concept is interesting and I would have love to understand better in order to test it correctly. If you add some additional explanation (here or in description) I will probably come back to test again :)
I can see the connection with the theme as waves of enemies, but I am not sure to understand the others layers of interpretation. This is the same interpretation than many other entries and for me it is quite weak, but still it is related (I have seen much more irrelevant entries aha)
Also I looked a bit at your codebase (did not consider it for my rating, just out of curiosity), ++ for Godot <3 ! I like how you organized your files, never thought of adding a "root/" directory for the game code, I may stole the idea from you. Also I was curious about your autoloads script, it looks like you have scenes to which they are attached and that you autoload those scenes, is there a particular reason for that ? I tend to directly autoload the script so I was wandering if there are any advantages of doing it like you do :)
Good job!