It looks like DotEmu brought the idea of a "linux-only enhanced port" of Raptor to fruition, but for Windows (idea for something like that was posted here a while ago). So yeah, that's your fault for being so slow. Do better next time!
I'm surprised I missed that link before, thanks for the heads up. At least the dev actually acknowledges Linux gamers and tried to port it. I can't say I'm surprised that Flash causes yet another problem on Linux.
Anyone heard of the Wintermute? It's some sort of "Engine Development Kit ... for creating and running graphical “point&click” adventure games". The source is licensed under LGPLv3. At the moment the engine runs only in Windows.
What's interesting, however, is that there are some indie game companies using this engine in their games. For example the Finnish Turmoil Games uses the engine on its upcoming horror adventure game Alpha Polaris.