If you haven't even started developing your game yet, why are you asking about sending out updates (if that IS what you were asking - no, I wasn't being sarcastic - new users often use weird terminology that means one thing to them and another to us).
Obviously if you make changes to your game, and you want people to play them, you are going to have to recompile and redistribute. How else would they get them?
In short - do not give it to other people until you are ready for them to preview, or beta test, or release. And when you do, make it clear that if you provide an update later and they take it, they will have to redownload the whole thing and very likely start a new game.
"updates" after a game is released are not a common thing, take a lot of work, and have to be planned and carried out very carefully. Normally, you'd want to release your game then move onto the next.