Drawing upon the themes was intentional. Also did you realize that to make the blocks slide, all you have to do was to make "gravity sideways"? I originally wanted "gravity up" as well and the direction of gravity would stay until the next wildcard, but that felt like scope creep.
I also thought of the "Alien" and "Twins" themes, as well as all the themes from previous Jams (2023's "Companion" and 2024's "Symmetry" as well as 2022's "Gravity" - recall how I said one of the proposed themes was identical to the theme from a previous Jam?) for symbolic purposes to me for being the only participant of every QGJ yet, but I couldn't come up with anything creative for them.