this is challenging and not a bad game, but i have one huge complaint about it all. When the screen scrolls up, everything begins moving incredibly slow, which isnt a big deal. but once it stops suddenly i start moving 5x faster and fly off the edges. I found it to be quite the flaw and it made the game frustrating. If you could work out the bug it would be great, tho! nothing too special about the graphics or nething, tho.