Partially, yes. But things can always be done if you know how to do this. However the higher the security, the bigger the problems. I can think of several ways to track if the score is legit (like the game stores all the items you got, right? so the game can calculate the value of those items (plus

and

, count separately the

and

+

, and also the times you get score from the

and

) and you will receive the score you should have. Maybe additional 50k for each

and x2 if there was a moneybag in the game... ) but this can be altered as well. There are some other ways that would be much secure, but if you lose your connection you may not be able to save at all...
Our world is full of people with low value for themselves, too little self esteem and everything, so they will try to cheat every game they can. The only thing you can do is - DON'T GET ANGRY ABOUT IT! You don't have to suffer because of other people's stupidity.