You put all this work, made a good game and now you want to remove it - your choice friend, but I would not recommend doing it. See, if you really want to make a progress, if you like developing games, you must understand that knowing the starting point matters for the destination forward - let me explain simple - if you want to lose weight, for example, how would you know how much weight did you lose if you don't get on the scale and see the starting point? If you want to become a great developer and improve with your next game, you need to have your previous work, so you can compare and see how far did you go.

Edit: Sorry for the long response, but that's how it should be. If you want, delete the game. Not being able to update the game doesn't matter, what matters is the end result, be proud.