Thanks for your comment! Glad to hear that. I tried to separate source to character move, main procs of the game, stage datas, and initialization. I believe that makes me easy to implement later. Especially those codes are getting bigger. But because of my knowledge of debugging program when someting went wrong, it is hard to figure out what is wrong in other included source file. So that, currently many codes that should be separated are in main source file.
About quit, I should remove quick quit key and make main menu like start/config/exit game before submit. Definitely, it is changed later!