Thank you for the review!
The character hitbox is indeed a bit off. The hitbox was created when we were using a placeholder sprite, and we only added the final versions of the sprite on the last day, and didn't get the opportunity to update the hitbox.
With the current number of abilities, having to choose one character per ability isn't quite as fun as it could be, but with more abilities and more puzzles specifically designed to work with the feature, having to decide which abilities go to which characters could be a very interesting part of the puzzle.
currently the boxes falling into pits is based on whether the center of the box is over the pit because it was easiest to code, but if we update the game after the Jam, that falling mechanic is one of the thing's we'll improve.