As far as I know uploading your game to the CS add ons section is perfectly reasonable and good for CS. For one it shows what Coldstone can do (but would be better if a separate 'Examples' section was made)
I think that type of game you can upload is only freeware. I think you have to email ambrosia if you want to upload shareware (but if it is good enough then you are probably better selling the game through them anyway)
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Pilky
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