The sketch and such: http://www.newgrounds.com/bbs/topic/1416390/4#bbspost25952921_post_text
Happy but probably wont get far in the contest! If you want to know how to ride this beautiful creature, you sit right between the wings, but instead of putting your legs down and interfering with the wings, you put your legs kinda, forward? like this: http://www.newgrounds.com/bbs/topic/1416390/4#bbspost25952949_post_text
The hump on its back is like a built in saddle, kinda like rhyhorn.
The purple gas is supposed to be purple fire but it looks like gastly's poisonous gas.