Press B (by default) to enter the interior mode. There should have been a tip, telling you about that. Other issues will be fixed.
okay. I was able to move the boxes and finish the mission. I really like all the clicky buttons and the interactive stuff! Very cool game! I look forward to seeing it finished! If I have one complaint, it's the sometimes frustrating inventory system, I like it mostly, but it does feel a little finicky. It took me a minute to figure out the backpack. At first I was just carrying it around by holding it. I only accidently found out how to equip it when I just happened to click on the back part, lol. Maybe a little note or tooltip explaining how to use it.