Wait … we are up to 30 ! The big Three-O. That’s a special round number for all of us fed and raised on a base-10 number system. I can’t possibly pike on this one, even if I only do a quickie 
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%%% Susie Oviatt
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Here’s a lazy copypasta birthday cake … demonstrating how not to get your compo assets
Chances are I’ll use Unity.
Other tools I’ll invariably use are the GIMP, Blender, bfxr (or maybe one of Mark Wonnacott’s tools). Maybe Caustic or NodeBeat or BeatWave for music.
Chances are I’ll do the compo, unless I get an uber awesome idea that just can’t be done without pulling in some pre-made assets (like if the theme really lends itself to ASCII art birthday cakes).
I’ve updated my basecode containing personal and adopted stuff today: https://github.com/omgwtfgames/unity-bowerbird
The parts you might find useful are SoundManager, MusicManager and maybe Autoscreenshot.