There's a size behavior under properties. 100% is normal sprite size and anything else will make the object grow or shrink. You can also mess with X and Y separately so it can be taller or longer..
If you want more pixels or just a bigger object for more colors and look, then open the sprite editor. Click the blue icon on the bottom right corner of the tools. 2 sliders should appear on the bottom of the screen and you can increase the sprite by 32 pixels (1 block) tall and/or wide.
Comments
Here's an example using X & Y;
http://flowlab.io/game/play/1202703
If you want more pixels or just a bigger object for more colors and look, then open the sprite editor. Click the blue icon on the bottom right corner of the tools. 2 sliders should appear on the bottom of the screen and you can increase the sprite by 32 pixels (1 block) tall and/or wide.