It's like a Dr Jekyll and Mr Hyde, one time you take stuff, and another you have to drop. Controls were a bit hard to understand at first, I didn't know you can drop the item pressing G, and that you can go inside of the truck. I would suggest making it simpler to go into the truck without having to jump, and have the control buttons explained in-game. Some guidance and feedback at what to do when he tries to buy a some upgrades or go to the next level would be good. Like you did with the "Drop items now" message. But overall it's a nice idea. Well done!