I think the core reason I managed to complete it on time is pretty simple: everything you see is code. That’s it basically a single script with no external assets. Except for seven audio files in total four music tracks (two looping) and three SFX.
And the other reason is called “rules” The time only counts for building your game, that is, any coding, making sound effects/music, art, and other assets. Writing a design doc, coming up with ideas, compiling your game, or making the itch.io page for it does not