Although it is actually easier to code, I don't really intend to do a flight demo, but a more general demo.
For WW2, my idea would be a WW2 Doom but with the ability to switch between first-person view and third-person view.
For Fantasy, your idea of Rygar is a very good idea, but I'm having a big problem with 3D graphics

Especially for monsters.
I think I'll start with a WW2 style and if it doesn't work, I'll come back to the idea of Fantasy in the Rygar style (because it's true that the current hero could be in a game of this style).
I will try to make a 0.2 test version in WW2 style for this weekend ... with (yet) another key for the jump Ian
Thanks all.
Note : My dream would be to build a Refractor 1 style engine, so your idea Erico of flying is not too far from mine, because in RE1, players can use cars, trucks, tanks and ... planes

Unfortunately for this dream, the 3D rendering functions of GLB will no longer be sufficient and I should code mine (and the code will probably not be 100% portable

).