Added Score

I have added a score to the game which will increase every time you collect an item. I might try to add a function within an item. And if I can't, then there won't be locked obstacles. However, I think it might be possible, because games couldn't have a health bar or a way to restore health without the code. I think the game can be beaten by getting to the end, but I might add a special requirement in order to pass each level.