Alright it didn't take him long to get back to me. Yes, tutorials and tweaks to difficulty are fine in your jam build! Overall if you have an update you want to add that makes it easier for Joel to understand or play, we recommend adding it as a post jam ver at the very least. In this case however, you're fine to update the jam build.
Yeah that is my main intention, I will upload a video from both versions so you can see the differences so it makes things easier for you and the rest of people judging and testing the game to see if they are valid or not. But even with all that in mind I will always keep the build from April 15th available. Thank you for clarifying.