When you view your updated game, make sure to click the Restart link in the top left to reset the game to the (new) beginning.
Also, to speed up the site we use a CDN (Content Delivery Network) which stores a copy of your game - sometimes it can take a while before this gets updated, so you may need to try again after a few hours.
You can't delete published games automatically yet, but if you contact me (email
[email protected] or use the contact form on the main site) and send me a link to the game I can delete it for you.