SUGGESTION: change the rattlesnake colours; it's impossible for us weird colourblind people to see the difference between pixels you've already passed and still haven't :O
All the sounds were sourced from what I believe to be the public domain, from open sound libraries to various mod communities, aside from the achievement sound when finding an easter egg.
One of the most badly designed maps I've ever seen.
TIP: try actually making new games instead of re-releasing stuff we've played a gazillion of times.
Sorry, sometimes bad things happen but autosave saves the day. Just try to hit page refresh and all should be fine.