Sandbox Interactive did state that they may extend the beta period past the initial 14 days, depending on what problems arise. Players that are interested in participating in the event can secure their access to alpha by purchasing one of the Founders Packs on the store.
There are 3 packs available, but only two of which give access to this Summer’s Alpha event. These are priced at $49.95 and $99.95, each promising an exciting variety of in-game perks and items.
For more information, check out the official website.
Source: Press Release