Presumably you pledged through IndieGoGo which means you should have received a confirmation email from them - we do not send any email notifications when we import pledges from IGG. We also don’t send any emails with instructions, which I confess is something we should probably change, so the fact that, depending on when your “last night” is, our mailer may or may not have been down it would have no impact on your pledge either way.
The next step for you is to download the game which you won’t be able to do until we release the Alpha. When we release the Alpha we’ll include instructions but all you have to do is go to the I:B website (https://inovaestudios.com/Battlescape) and click the
Download button which should become visible at that time. This will allow you to download and install the launcher which, after you start it up, allows you to download and install the game.