diff --git a/index.js b/index.js
index 0835ae8..91352d4 100644
--- a/index.js
+++ b/index.js
@@ -147,8 +147,9 @@ function handleKeys(params) {
                     params.camera.position[1] += 0.1;
                 } else {
                     if (params.jumpAmount > 0) {
-                        params.camera.velocity[1] = 5.0 / 60;
-                        params.jumpAmount -= 5.0;
+                        const amount = 0.4 * params.jumpAmount;
+                        params.camera.velocity[1] += amount / 60;
+                        params.jumpAmount -= amount;
                     }
                 }
                 return;
@@ -190,7 +191,7 @@ function updatePhysics(params) {
     params.camera.position = newPos;
     params.camera.velocity = newPos.map((v, i) => v - oldPos[i]);
     if (isOnGround) {
-        params.jumpAmount = 20;
+        params.jumpAmount = 6;
         params.camera.velocity = params.camera.velocity.map(v => v * 0.7);
     }
     params.isOnGround = isOnGround;