Thanks! Sorry to hear that it happened to you as well, I could not pinpoint the problem as it does not happen very often when tested and ran out of time to fix it. Sorry for the inconvenience!
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No problem, I still enjoyed playing the game a lot :) For debugging: it seemed like when I got too far from the slamming white block which the flyers were attached to it got de-selected (didn't have the option to press space on it) and I could not re-select it either because it was too high up for me to be able get next to it, and so the flying companions were unable to be called back. From that I think the problem lies with the way selecting and de-selecting of the white blocks works.
I hope this helps you fix the bug a little easier if you want to keep working on the game :)