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I'd say: Keep it coming. If you add a few new things every once in a while, you will end up having a big little game. 
Just hope that, when the game grows, the game type stays the same. I loved another very basic RPG before, then the dev made it all big and added free walking and stuff, and then I lost interest :p 

I'll be careful. I worry too that I'll add too much but I keep backups. Format will stay the same I promise, but adding too many different events can make the balance impossible.

If the format stays the same, I think you can not add too much. More monsters and items would always improve any game. :p 

Oh I'm not sure about that. Look at board games like Talisman with all expansions added, it becomes close to unplayable and very intimidating to look at.  Maybe depending on HOW you add things makes a huge difference. Even if I have very powerful monsters appear on the first turn, I can control the chances of that happening and make them low. Point is, I'm afraid of bloating and confusing the player too much.

Okay, maybe always wasn't the right choice of words... :p But in this case I don't see how it can do any harm for a randomized dungeon like this.  Specially since it is endless. As long as you don't make too make unbeatable ones, or required ones.