Only allow a single dash in the air

Assets/Scripts/PlayerControl.cs

@@ -36,6 +36,8 @@ public class PlayerControl : MonoBehaviour
     public float dashCollisionCoolDown = 1.5f;
     [HideInInspector]
     public float currentDashCoolDown = 0.0f;
+    [HideInInspector]
+    public bool hasLandedSinceLastDash = true;
     // public float jumpWaitTime = 2.0;
 
     [HideInInspector]
@@ -109,6 +111,7 @@ public class PlayerControl : MonoBehaviour
           lastDashStart = Time.time;
           currentDashDirection = dashDirection;
           currentDashCoolDown = dashCoolDown;
+          hasLandedSinceLastDash = false;
         }
 
         if (isDashing ())
@@ -118,6 +121,10 @@ public class PlayerControl : MonoBehaviour
         else
         {
           bool grounded = isGrounded();
+          if (grounded && !isDashing())
+          {
+            hasLandedSinceLastDash = true;
+          }
 
           velocity = body2D.velocity;
           if (Input.GetKey(keyCodes[(int)Keys.Right]))
@@ -222,7 +229,7 @@ public class PlayerControl : MonoBehaviour
 
     private bool canDash ()
     {
-        return getDashTime() >= dashCompletionTime + currentDashCoolDown;
+        return hasLandedSinceLastDash && getDashTime() >= dashCompletionTime + currentDashCoolDown;
     }
 
     /*==========Power Ups // Bullet management ===*/