i5 is the Intel processor type (there are three types, i3 = budget, i5 = standard, i7 = high end). That particular laptop we were testing on is a two year old office laptop, it was never meant for games. You definitely don’t need a high end machine to run UNION.
Performance, especially on older machines, is a concern for us. We’ll do our best to make the game perform well on a wide range of computers.