Getting started:

Setup a up web server
python -m http.server 8000

Then navigate to
http://localhost:8000/

Tools:

For sprite, tilemap and atlas work
  https://www.leshylabs.com/apps/sstool/
For Tiled Map Editor
  https://thorbjorn.itch.io/tiled
For simple js sound clip generation 
  http://github.grumdrig.com/jsfxr/ 
For music generation
  http://www.earslap.com/page/otomata.html
  http://www.earslap.com/page/circuli.html