Thanks for playing, and also trying out the downloadable version! I'm glad you liked the generation system, I'm quite proud of it, I came up with it last second. Time pressure really does force you to be creative!
As far as I'm aware, both the HTML5 version and the exe can spawn you underneath the map. But if you had a free moment, would you be able to leave the HTML5 version open in a tab for a bit, and tell me if it really never does spawn a world for you? (Incase it's affected by hardware).
Unfortunately, I noticed the spawning in the middle of nowhere happening last minute when I added randomize() to the beginning of the code and suddenly, this error started happening. It was too late to fix it so instead, I just added code that automatically restarts the game if you fall out the world.
As for not being sure how to play, there isn't really anything to do other than explore, I'd barely even finished the art by the end of the 24 hours, as you can probably tell (some things without outlines, weird placeholder graphics around the place, etc).
Did you have any feedback?
Oh, and how long did world generation take for you?