This is my official page for something I didn't make, but I am sure the guy who made Game Maker would appreciate support and advertisement. I have liked Game Maker since I downloaded it. The graphics interface seems more than adequate, and the maker of Game Maker obvious knows lots about gameplay.
My assement is that is program does what needs doing, but it does it very slowly. I was playing the "Gradius" clone and it got choppy on my computer. My computer specd are :PII 266, ATI Rage II, 128 MB RAM. I can't think of anything else that might effect the performance. However, since most people have a computer that they actually paid money for, then I doubt you'll have as much trouble as me.
Here is the link to the files that I use.