You should also fix the bugs with the objects getting stuck at the walls (This is a common error made by GameMaker novices I see. Before inverting the speed of the object, you should also move it beyond the object it collides, to avoid this. A simple "x = xprevious ; y=yprevious" in the collision will do, though there are better ways to do it)
Honestly, the game box graphics aren't the worst problem.
The real problem is the lack of depth in the gameplay. Maybe I didn't play everyting the game had to offer, but surely having the enemies earlier would avoid the player getting bored too soon.
Have you considered getting a graphic artist to draw to you? It makes a world of difference. Take it from a programmer who can't draw to save its life

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