I'm quite impressed with this game! I really like the retro art style!
One thing that would make the experience significantly better is to avoid displaying the same text multiple times after death.
Another thing would be to display the HUD at a higher resolution than the game's low-res. look to increase legibility. This can be achieved by rendering your game (with its low-res. look) to a texture (I believe godot allows this?) and then outputting it at the same resolution as the player's monitor. Godot will automatically scale the resolution of the HUD to this higher resolution.