Very cute game, so far I really like the art style, the mechanics (especially the bubble and how you can chain jumps together with it) and I just like how cosy it feels.
If I were to nit-pick, I'd say maybe include some sort of indicator of how many friends there are left to save in a specific room/area of a level because I can see it becoming annoying after a while (or at least have it be an unlockable for beating the game with a certain percentage), there's also the issue with saving which some others have brought up.
Overall I look forward to the finished game.