Hi, the levels are randomly generated based on the date seed. There are an infinite many number of levels based on the dates. This is a web port of my mobile roguelike Twilight Dungeons with various redesigns and simplifications to add a 'daily run' idea (in line with the rule "You CAN use external libraries, game engines, pre-existing code/algorithms, pre-existing art, etc. You can even start your game from an existing game if you are planning to turn it into something unique."). I believe this format where you replay the same level each date is an interesting format to present procgen-ed levels, and makes it a bit easier to access for the public since it fits how people play mobile games ('bite sized' engagement). As reference, https://rogule.com/ was a submission to the 2022 7drl with the same idea.
If you're curious, here is the source code for the floor generator - https://github.com/hellochar/Twilight-Dungeons/blob/web-port/web/src/generator/F...