tweak coin spawn rules

right_coin.lua

@@ -65,6 +65,7 @@ end
 
 coinCooldown=160
 coinTimer=coinCooldown
+maxCoin=6
 initialCoinDrop=4
 coinSpawnCount=2
 colors={"blue","red","yellow"}
@@ -129,7 +130,7 @@ function randomValidSpawnLoc()
 end
 
 function canAddCoin()
-	return #coins < #spawnLocs
+	return #coins < maxCoin
 end
 
 function addRandomCoin()
@@ -543,7 +544,9 @@ function updateGame()
 			currentState = GameState.market
 		end
 	end
-	if coinTimer>0 then coinTimer=coinTimer-1 end
+
+	if not canAddCoin() then coinTimer=coinCooldown
+	elseif coinTimer>0 then coinTimer=coinTimer-1 end
 	if coinTimer == 0 then 
 		for i=1, coinSpawnCount do
 			addRandomCoin()