Firstly, thank you so much for playing my game, and for the feedback :) !
As for the puzzle on how to get Alvin across, that's possibly me not being good enough with allowances/hints again (see the other comments). Hint: you can push certain objects ;).
This is something I probably should've had one of the characters do earlier in the game (like when you can't progress into the living room/kitchen without picking up plushie Bobbes), but I guess I assumed that pushing objects is such a staple of games like this that, I assumed players would try it.
But again, thank you so much for the feedback! This is my first game jam submission, so obviously it's been a learning experience. I'm working on a 1.2 version of this game where I make it more the way I envisioned it, without the time constraints (and perhaps with more puzzles - this game was meant to revolve around puzzle solving), and every bit of feedback helps :) .