Nice game! Dropping cubes is a cool addition to the normal 2d jump and run shooter. :)
Graphics are nice, but the background music was too repetitive.
Controls felt a bit counter-intuitive to me, but that is just personal flavor. Would have been nice to adjust the buttons but that's probably too big effort to add for a game jam.
Game suddenly was way too hard for me when I reached the second container to protect. A ton of enemies + flying enemy were too much to protect it for me. Probably I didn't understood how to do it. :D I dropped a lot of containers in advance to block the container, but that didn't helped much.