Lighthouse Havoc opens on a good premise: survivors of a demon apocalypse shelter in an island lighthouse, until the light itself draws the horde and your friends are taken. You go out into the dark to get them back.
It's a shooter with a rescue objective rather than a survival one, which gives each excursion a destination and a reason to come back rather than just a kill count.
Rescue the friends captured from the lighthouse and get them back safely, fighting across a demon-infested island to reach them.
Yes — you carry several and switch with the scroll wheel, which matters because the island has both close and long engagements.
Yes — it runs in the browser with nothing to install.