I think it would be cool to have a side view shmup with randomly generated levels. I've just finished a dungeon generator for roguelike games and it could be used for this. They would have to shoot down 4 door switches and then get to the exit within a generous amount of time.
A level may look like this where the exit is the orange door. (No switches shown here)

The player would have to milk the dungeon for bonus point items and other goodies while shooting down enemies and getting the door unlocked.
Items may include time extensions,lives,points, and effects like freezing all enemies.
Your thoughts? I think it would work really well and play as a solid shmup first then as a pseudo roguelike.



