Tweaked tech tree and for marsh

core/src/mindustry/content/Blocks.java

@@ -2452,6 +2452,7 @@ public class Blocks{
         //TODO rename
         chemicalCombustionChamber = new ConsumeGenerator("chemical-combustion-chamber"){{
             requirements(Category.power, with(Items.graphite, 40, Items.tungsten, 40, Items.oxide, 40f, Items.silicon, 30));
+            researchCost = with(Items.graphite, 2000, Items.tungsten, 1000, Items.oxide, 10, Items.silicon, 1500);
             powerProduction = 9f;
             consumeLiquids(LiquidStack.with(Liquids.ozone, 2f / 60f, Liquids.arkycite, 40f / 60f));
             size = 3;