It's basically Earth Defense Force with swords.
Sandlot probably isn't a familiar developer name to most gamers, but it's one that should be. The team is responsible for the campy Earth Defense Force series; a third person shooter focused on protecting the Earth during an alien invasion. Those who do know the series will immediately understand the team's latest endeavor, Zangeki no Reginleiv. The game, published by Nintendo in Japan, takes the guns out of players' hands and replaces them with swords, bows, magical staffs, and other medieval equipment. Though the weapons have changed, players will still fight hordes of enemies waves at a time, but rather than aliens, players fight ogres in an ancient, medieval land.