Glad you think so!! We are aware of the platforming issues.. we really didn't have enough time to playtest through the levels :(
We wanted the players to enjoy the different endings at the end of level 10, but it seems like that'll be difficult to do so without the fixes.
Regarding that bug, I think you might have jumped high enough somehow to hit the invisible lose boundary of the game. That definitely shouldn't happen and we'll look into that. Thanks for bringing it up!