Yeah, Blow has a generally unfavorable opinion of scripting in game engines. Jai (the language) gets around that by being very fast to compile debug builds, about 150 kloc/s, which he says he intends to optimize up to 1 mloc/s. Order of the sinking star compiles in about 2 seconds for a clean build, so iteration can be basically as fast as what you'd expect from scripting.