A Project in the Making: Skree
The game Skree centres around a small ant-sized guy who can run pretty fast. It is primarily a platforming game with some enemies throughout, some bosses. The game starts out with him in an underground tunnel system, having to run and jump his way through to the end over many obstacles, obtaining many additions and powerups along the journey. This is a very popular game and is available on many handheld systems, consoles, computers, and even has its own Arcade machine, since it was made long ago starting out in many arcades.
(This is still an original idea im in the process of making so you can expect further additions to this one, its popularity is supposed to match that of pacman and such.)
(Concept Art:
just a quick sketch)