The way collectibles are only counted if you get to the exit will definitely be changed if I stick with the collectathon style. It's that way because the game is currently in a weird sort of transition state between the linear level and collectathon. Previously getting to the exit was the main goal, now it collecting so I just combined the two. Doesn't really make sense and is frustrating, yeah.
Considering the weird movement, Have you played the 0.4.4 version? I've tweaked air momentum after submitting to this Demo day.
I'm personally really happy with the basic movement otherwise so it likely won't change much. It does take quite a lot of getting used to if you're coming from platformers with little or no momentum like what is popular right now.