I figured that since I can only draw poo, I decided to just be a simple as possible. The flag is a half way point. And the face icon is an achievement marker. I guess the top of the screen is the hud. But I don't know yet or what to show.
There will also be a "helpful" arrow on the screen. Pointing in the exact direction of the level exit. Which may or may not be the most safest of directions to go. Since I like to play them, I figured it wouldn't hurt to try my own kill yourself hard platformer.