I recently tried to request a game called "Kill the Emoji" the categories would have been, first death, first to 25 kills, etc. It got declined though, the reason was that it had no ending. But I then see games like slither.io on the website, and that game does not have an ending. So I was wondering what counts as an ending for a game. Please help, thank you.

That game was added before stricter rules were put into place for requesting games. An ending for a game is literally what it sounds like a - the game ends definitively.

Also, no reason to make the same thread twice 2 minutes apart.