Thanks for playing! Personally I definitely want to add some more stuff to the game that would differentiate it from the rest of the genre, so many ideas. You can follow the game on itch if you'd like to receive updates!
To clarify, our 3-2-1 theme interpretation is implemented in the way the gems multiply your bonusses. Most upgades have an upside and a downside. Putting it in the x3 slot triples the upsides, but also the downsides. Idem for the x2 and x1 slot. We didn't really find a way to emphasize this because we had so much other stuff to build! Should have just put a text intro explaining that before the game starts haha.