This is really nice for a one week game jam. I love how it fits the theme, it looks great, and it's extremely well polished.
I do like to give at least a few pieces of critical feedback, so I'll do my best. You might want to focus on making differences in kind, not just differences in scale for your team ups. maybe doing something like increasing range, blocking off squares for opponents, making you invisible to the enemies, etc. I do understand that it fits the theme and you probably did not have time to make those kinds of adjustments, but I thin it would improve your game. also the music is a bit repetitive, but that's really nit picking.
but again, great job, loved the game, and thanks for making it.