The idea is cool (and you were right when you said it’s similar to our submission), but there are definitely a few things that could be improved.
This is a sokoban-style game. It really shouldn’t be using rigidbodies. I can understand wanting to use a built-in system when possible, but doing a small bit of work to make a grid-based system would make the game a whole lot better. The rigidbodies are annoying because they can move only part of a tile over and get stuck on the edges of walls and such.
Buttons should be able to be held down by the player. This one is probably simple to implement, and is very important for any game with buttons like this. Players need to be able to see what an element like this does before they get a box to it.
The blue boxes are way too prone to causing a softlock, and there doesn’t seem to be any way to completely reset a level, meaning you have to restart the whole game if you make a single mistake with them.
The level with the three boxes, three buttons and three doors was where I stopped playing. It seems like it’s physically impossible for me to get a box onto that lower button. That seems like something that would be picked up by playtesting, so definitely see if you can do as much as possible for the next game you work on!
All things considered, this is still really impressive for the amount of time you had. You should be proud of it! The feedback here is for the purpose of improving the game, or for keeping in mind to improve your next game, but that doesn’t mean the game is bad by any means.