I think you should write down search examples on your website to make it clear for people how to search. That placeholder is not good because once I type anything, it disappears and I need to remember it or open another tab with an empty form to read the placeholder and edit it according to my requirements.

In overall, it loads quickly and nicely but I think that the search has some problems. For example, I tried to search author:shield132 "Overfeat" but it didn't load anything while I have mentioned the word Overfeat in my posts before but ninjastic.space's search can't find it.