I didn't really get the connection to the theme of "Only One", but I did like how you can go around exploring, growing your squad of squares. I think there's a lot to explore here. Reminded me of Link for NES. Keep it up!
The "only one" was used on the visuals here, "Only One Shape: Squares". Not the most interesting take on the theme but it's what worked for me.
The first Zelda was a huge reference here definetly.
Thank you for playing!