Monkey on a computer playing sokoban

I'm at my dad's house for one week so I decided to make at least 5 games in that time period.

The first game is about monkeys in a block-pushing game.

Source code : 
https://www.puzzlescript.net/play.html?p=7367bbf1dc1d8fc11ee110bd96f72f91

Controls :
- Arrow keys to move
- X to select
- Z to undo, R to restart