In theory, yes. But that would be highly un-practical. C2 is designed to program your game using the editor.
I'm trying to sell the source code but I don't want to force him to buy it. I offered myself to make any necessary adjusts but the client don't want to be dependent on me, that is fair enough. So, I can tell him that it is possible to make only small changes or great modifications too through the runtime?
And about the Construct 2 references in the runtime code, do you know if it is possible to remove it? I don't want him to know that while we are in negotiation.