minor text fixes

js/Level.js

 		this.ctx = canvas.getContext("2d");
 		this.lastTime = null;
 		this.raf = null;
-		this.minPhysFPS = 30;
+		this.minPhysFPS = 20;
 		this.minFPS = 5;
 		this.backgroundColor = "#87CEFA";
 
 				// We accept really low FPSes,
 				// but if the FPS gets too low, we want to run multiple
 				// physics steps in the frame.
+				let physdt = dt;
 				let nSteps = 1;
-				while (1 / dt < this.minPhysFPS) {
-					dt /= 2;
+				while (1 / physdt < this.minPhysFPS) {
+					physdt /= 2;
 					nSteps *= 2;
 				}
 
-				if (nSteps != 1)
-					console.log(nSteps);
+				if (nSteps > 1) {
+					console.log(
+						"Too long between frames for physics ("+dt.toFixed(2)+"s). "+
+						"Running "+nSteps+" simulations in one frame.");
+				}
 
 				for (let i = 0; i < nSteps; ++i)
-					this.physics(dt);
+					this.physics(physdt);
 			}
 
 			this.draw();