Download of Gridrunner++ 1.0 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The program lies within Games, more precisely Arcade. The actual developer of this Mac application is Llamasoft. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software.
From the developer:
Gridrunner++ is an arcade shooter game that invites you to take a trip to the Zone with Llamasoft. You face wave after wave of increasingly ferocious and insane opponents in glorious, retina scorching, psychedelic themed parallax scrolling levels. You are provided with an online high score table so you can play against the rest of the world.
You may want to check out more Mac applications, such as Detritus, SwordEdge or BumpRace, which might be related to Gridrunner++.