So, I've been polishing the engine for this game I'm making. It's really very smooth. It's a shmup - a scrolling shooter - but with a strategic element where you can choose which levels to go through and what equipment/crew your ship has.
The scripting is very powerful. You should be able to create any similar-genre game by simply substituting your own script and graphics.
It's still a week, probably two, away from having nice screen shots. But the core engine is nearly done. Just need to add tile map support and "cut scene" support.
Here's a piece of an early mockup graphic from the game: