The main thing is the funny anecdote about Lua that I shared over there. I'll post it here too. We used Lua for all of the visual programming for the music tracks. This was not allowed by the 2008 App Store policies. We decided to just rename all our .lua files as .cfg (.config?) to obfuscate our rule bending. After the app blew up in popularity, Apple eventually reversed course on this rule.

Here's another fun link. This is Steve Jobs playing Tap Tap Revenge 3 during an iPhone keynote: https://www.youtube.com/watch?v=YXQT19gl1eg#t=14m50s

And here's a fun photo album of interesting stuff, our Palo Alto HQ, and more: https://photos.app.goo.gl/WDUfEV7ivAqyJ1rFA