no, it isnt a brwoser game...
its.. well an online game.
you conenct to a server, choose a session and then play with other guys bomberman over the net... of course with A6 but powered by populace
so it's a full online game. no offline mode (at the moment).
you can play it in LAN without any problems, but I optimaze the code to be playable over the internet.
but I don't know if you mean "casual games" = games for a single person... like pacman or... solitaire