Thank you for the feedback, we did end up having a large inspiration from WALL-E yes, even if the initial idea was not based on him at all.
As for the battery, we figured out after submitting that it was quite hard to pick up due to the way the interacting worked, if you do wish to try again, all you have to do is aim the center of the robot at the battery and you should be able to get it. There is an image further down in the comments from Asher Farag, another developer on the project, where he shows the angle that pretty much always allows you to pick it up. If you would like to give it another shot i'd love to hear the rest of your thoughts, if not however, im glad you enjoyed what parts you did play. Thank you.