Hello, I'd like to know something. I like to draw my backgrounds at half size and then double the size so it look pixel-ish. And if I draw my characters the same way, how do I make it so they and maybe even the mouse cursor move with the, every pixel is 2 pixels, thing, so it's not like my character is in between pixels and looks out of place, if that makes sense.
The simplest way to make it look pixely is to create the game in a low resolution, like 320x200. Are you sure you want it to look even blockier than that?
If you do, it should be relatively easy in repeatedly_execute_always to check the characters' positions and make sure the x and y coordinates are always even (and the same for the cursor). The only problem I can foresee is if changing a character's coordinates interrupts their walking. In that case, you might want to use an invisible character that actually does the walk, and a display character that you move manually to follow it to the nearest even coordinate.
I've noticed something while reading some posts about walkspeed, it seems when you set the character movement_linked_to_animation, the speed will actually represent the number of pixels the character jumps while walking, so if you set the speed to 2, the character should be walking 2 pixels by 2pixels. It looked like that the last time I tried and since I wanted a smoother movement I had to turn movement_linked_to_animation to false. It might be intresting to have a look at that and see if it does what you want.