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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
But you only see a few test cases. When you submit, there's probably hundreds of these tests run. So, is it really fast enough? :P
It could simply mean that CodeWars itself that was having problems. You should simply resubmit a few times, or copy your solution and refresh, try again. You should've received points for solving it, even if you didn't submit it.
I tried your solution and what I get is:
Your code is too slow.