Thanks for your feedback :)
We thought about implementing keyboard shortcut to control upgrade and refill. But after some play tests it feel "doable" even if it was hard. We thougth it deserved better the gameplay to HAVE to click on buttons AND control your shuttle :)
We're working on a Post LD version, we may add some keyboard control is we can manage to balance well the gameplay with this way of control :)
Stay tuned !