A button system for the shmup i'm working on. Has shooty and swordy sound effects but no graphics, so you'll just have to imagine the cool attacks and the enemies and stuff.

Hold O (Z on keyboard) to fire
Press X to swing your sword
Hold X to charge up mega slashes
Hold O and X to swing your sword as fast as possible

There are definitely some kludges in the code, and most of them are there because the alternative is implementing input buffering and I am not ready.