Before you down vote let me give some restrictions.
I like RPG but they seem long and hard to make but after you make the framework the rest sort of falls into place where as platformers never get faster as each map starts from scratch.
So under these conditions what is the easiest genre of game to develop as a hobby project.
I am on my own.
The style of graphics must be available. Can be ripped (not publishing).
Not bothered about commercial quality.
Must be real size game, multiple levels and stuff.
I build games in C++ and Direct x 9.c