Uh, excuse me? Your games aren't simple, just short.
The endings are very simple, but that's really up to you as to how you do them, same with dialogue. But if you did change some of them, I feel like the game would stand out more and be more 'unique' as so to say... This was just my opinion to make the game more smoother to play...? I'm sure that's not the right word, but I hope you get what I mean. xD