Hmm, and I thought I was doing ok.. Any tips on soldering something to a puck? When ordinary skills aren't good enough...

Hm, that doesn't look bad - like, I can't see for sure due to the lighting, but you should have to really work at it to damage the traces under the solder mask - and i don't see any other signs of excessive heat (which is usually involved when people damage things while soldering) or scraping - the ways you can cause problems while soldering something are pretty much bridging two connections that shouldn't be bridged (could you have done this somewhere? maybe between Vcc and Gnd?), or getting the pads too hot for too long with a soldering iron that is set to too high of a temperature or isn't temperature controlled, or being rough with the soldering iron and scraping the solder mask off the top of a trace; it doesn't look like that happened anywhere here.