To think of ideas for games. Look at other peoples games and mash some ideas and concepts from another. Look at popular X-box 360 games and see what you can come up with. I have hit the point where I am out of ideas, but they just flow eventually.
Another thing that helps with ideas is going on websites like MiniClip or AddictingGames and seeing what you can find there. The games are simple and fun, like most Alice games are.
I'm not saying copy directly, but it is another excellent source for ideas.
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making a good game in alice is tough because you don't have custom ENV. I mean like, you have this big world, but than when you actually add stuff, you realize it'll take a lot of stuff to make it look like something real. Big issue. Try figuring out how to overcome this first.