Here's my opinion: You actually have a lot of interesting mechanics that result from using the bubble with nuance and through figuring shit out. That's awesome. The part in level 6 where you use it, knowing that the bubble pops with proximity to objects to hop over the fan is really good and really good design as well. But for a lot of people (including myself) the lack of explanation / jankiness of the controls makes it too frustrating.
That said, that's just my opinion. Some would probably call it genius. Either way, good game, m8