Thanks for playing! What's the platform you're running on and could you provide a screenshot? The main menu uses the exact same DynamicFont as the in-game HUD. Godot should handle the font scaling: on my system it doesn't look blurry even when the game is resized to 4K resolutions.
Viewing post in Lavakinemat Inc. jam comments
I'm sorry I've got the wrong impression, but still, I cannot reproduce this on a normal environment.
EDIT: This bug has been fixed in the latest builds: https://aemetta-toasteater.itch.io/lavakinemat-inc/devlog/82123/fixes-to-windows-specific-bugs