Good question, @Tom73 -- though sometimes there just isn’t a satisfying answer.
Technically, the answer is simple: buyers are more enthusiastic than sellers. But of course, that just shifts the question -- why are they more enthusiastic?
My guess is that it's a combination of thin liquidity and rising interest from "retail" investors. The announcement was positive, sure, but it’s probably being perceived as more significant than it really is. The order book is so shallow, even a modest $30k market buy could push the price up another 5% from here.
Plus, when you’ve seen a stock run from 10c to 80c, FOMO kicks in. A strong upward trend can become a catalyst in and of itself.
But who really knows? Hopefully the indiscriminate buying continues!