Well a few years ago my friend Undy and I made a game called Halo Combat Evolved 2D, well we lost everything so I made a better remake of it! It's at final release 1.5, and when final release 1.9 comes out we should 100 levels, I only have 20 levels now, and 2.0 will have new amazing cappabilites you should read in the Help section!
http://www.yoyogames.com/games/show/59072Its fun but room for improvement, I have 1.5 done so far, and when 3.0 comes out it should be perfect