Nice - thanks for adding us pulsecat. I made the statement below in another thread, but it's applicable here too. It's just a precaution that applies to any third party service related to Kraken - nothing specific against Cryptotrader.
Generally speaking, it's great that people want to offer third party services related to our exchange. However, such services are used entirely at your own risk. It's up to you to do your own due diligence to ensure the service is safe to use. Another thing to keep in mind is that when you use any Kraken-related third party service, it's best not to use the same email that's associated with your Kraken account, since your Kraken email is a potential point of attack for your account. Of course, you also don't want to use the same username, password, etc. Whenever you use a third party service, you shouldn't give the third party any information that might be used to discover or gain access to your Kraken account.