Increase Score When Moving Up (Script Help)

I have a script already and it works but it moves up way too fast and it moves up when just going up and not on an increment (ex:

• = platform

1. --

2. -- 3, --

If moving from 3 to 1, I could just jump between 3 and 2 and the score would rapidly increase. I want it to go up per platform instead. Also, once the game starts, it automatically starts making the score negative...`using UnityEngine; using System.Collections;

public class Score : MonoBehaviour { %|1781920597_1|% %|573040171_2|%

%|876895427_3|% %|1250423434_4|%

%|1765374721_5|% %|233348866_6|% %|-370545286_7|% %|1565015250_8|% %|1864517976_9|%

%|-1638603090_10|% %|1964884180_11|% %|720907755_12|% %|1716919703_13|% score++;

%|-1231739958_15|%

%|-641501010_16|% %|-850341954_17|% %|517336329_18|% %|1873098325_19|%

%|156636085_20|% %|1722921110_21|% %|-1416318127_22|% %|-822119152_23|% } `