Droblin, that's the exact thing I couldn't see from here. You named the real hole: every level asked for the same hold, so there was nothing new to learn.
So I changed it. The required charge is different at every level now, short, long, shortest, longest, and it keeps moving. The opening demo actually jumps too, so the first thing you see is hold, release, fly.
If you come back: the question is whether it now feels like "something new is happening" as you go. If it goes flat by level 5 again, tell me, and that's the next fix.