I love tower defense, and so this game
The pixel art its really pretty and cute, the player and robots designs are pretty nice. I say that the tower design could be something different and more interesting, but it's good enough for being made in 48 hours
The music and sounds are right, there is nothing to add or discuss in it.
The concept of controlling a character in a tower defense game sounds great, and it fixes one of the genre biggest flaw, boredom. The friendly fire mechanic really fits the game jam theme, 4 towers and it can become a bullet hell, I'm really thinking who is the enemy here haha.
It's a really fun game and I would love more games to explore the same concept.
Keep it up and keep it souled!