Roto-zip could work well like the other poster said. If you don’t have access to one, you can also use the abrasive sanding bits for the dremel, you may chew through a couple, but they work in a pinch.

I highly recommend looking into Spiderweb Software games. They’ve been pumping out top down turn based tactics rpgs for years now. I am not sure of the viability on Linux, but I’m sure there is a workaround if anything.

The Avernum series in particular is great if you’re into detailed character building, exploring, and high difficulty optional quests/bosses!