I remember playing this two years ago when it came out on Kongregate, and it's possibly my favorite platformer web game of all time. There are relatively few mechanics, but they're all used very well and thoroughly, and the style is simple but appealing. I'm glad that you finally released it on Newgrounds. Anyway, for anyone who wants the true ending, you need to find the three secret racecourses: northeast of the blue building, you need to get momentum from the upwards air; west of the red building, there are nozzles on the surface of the water; and east of the yellow building, fly up from the second-lowest cloud to the upwards air on the right.