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This whole thing was written in HTML5, CSS3 and Javascript (using small bits of jquery). For the basics I was following the "Exploring HTML5 Canvas" Tutorials (Part 1 - 6) by Devhammer. Thanks for the great Tutorial!
For some other stuff, like how to write objectorientated javascript I was following the tutorials over at http://www.codecademy.com/, which is a really great site to learn Javascript and also other languages.
If you understand German you can also read my blogpost about this site: "Pacman in HTML5 Canvas".