Thanks for your interest in the project!
At the moment, we are processing pledges, and there is no way to back or reserve a copy of the game.
In a few weeks, we will make normal pre-orders available to the general public. We'll send out an announcement via our mailing list when this happens, so you can jump onboard at that time and reserve your copy.
Right now, the best thing to do is to subscribe to our mailing list (about halfway down the front page of our webstore): https://www.level99store.com/