Unlike NSynth, synthem80 is directed to a specific and humble goal - make early 80s-style arcade sounds. It uses a mini-language to control an engine similar to that in Pacman.
For instance, the sound when Pacman eats a ghost:
./synthem80 -o eat-monster.sw 'timer(t=0.5) wav(wf=1 f=2 a=45) add(a=< b=48) nmc(wf=5 f=<)'
I do think it's interesting and valuable work. But it's worth bearing in mind that there's no shortage of great resynthesis tools already, and that musicians are besieged with offers from technologists for Sounds! That! Have! Never! Been! Possible! Before! While you can always rely on Jordan Rudess to provide a celebrity endorsement to the keyboard collector crowd, most hobbyist musicians eventually get over chasing novelty and end up reducing their equipment load to a smaller number of really well-engineered devices or software tools that they really like and get to know inside out.
I've always wondered how much classical music sounds the way it does because sheet music is the way it is.
But in this case you could imagine the right balance where it does end up with a significant savings.
Woo hoo you built a noise maker! Kazoos for everybody!
Snark aside, there's a lot of really awesome creative potential stemming from WaveNet. This just seems like the least novel application I've seen.