Not the worst way to go about putting in a rogue system here! The main drawback for this, though, is that big groups don't get collected all at once like they should. I click on a group that has 10 or more and only five or so get collected. I get that there's the white lines around the squares showing you how what will clear (which took a while to figure out) but... why not just clear the whole group? Despite being crude graphics-wise it's overall not a bad idea and I did have a good 10-20 minutes of decent fun.