Here is some concept art from my 8 year old son – two units we will have in the alien invasion arcade game we are working on. He likes to mock things up in Minecraft. I am starting to train him with MagicaVoxel which is what I am using to build the voxel models for the game. These units will likely grow in detail over time. I am focusing on a programmer art approach which is to get things in then refine them over time as the game play takes shape and the fun emerges!
