I have quite a strange problem as well. every time i get to makeing my 3rd room my character will not move and with in a few seconds die. Does anyone know how to fix this?? It's driving me nuts!
One good tip : There are a lot of simple games that come with game maker, search them in the game maker files, they have packam, racing and i believe a shooter too. Look at these games and see what they are doing, memorize, try it out, and then soon you will get what each action does. Also use logic and read the tutorials. You can also use google.