A classic 推箱子 game.
These games are always very fun because of the core concept. However, as this is a classic, it always need something new to be fun. Which you achiveved with the simultaneous block moving.
I think the art is pretty raw and the music is kinda repetitive, but for a 1 week game is pretty cool.
And last but no least, the switching colours could have a shortcut in the keyboard. I just have to use the mouse button for switching colours. At the page, it says that 1, 2. 3, ... switch colours but it didn't work for me. Also, this info could be into the game and not only at the page.
Fun game.