The Blend4Web team has created an impressive WebGL-based game with their platform. You can play it now!
Blend4Web Team writes:
After many months of diligent development, we are excited to present our first real game - an arcade game called Petigor's Tale! It started out as a series of tutorials for creating games, and in time, Petigor grew beyond these boundaries, acquired a certain identity, achieved a different, more complete appearance and simple, yet intriguing storyline.