Balance is quite hectic, and one of the worse parts of the whole game. Early game has a lot of active clicking paired with researches which are (by design) an idle feature. Since the AI doesn't choose best matches it'd often end up taking away some perfect combinations earlier in the game. Later on it gets quite idle especially with the last research.
Uniqueness- Nice style of matching game I haven't seen done a lot. Shut up and take my 5 stars.
Fun- Despite the balancing quirks I still think it was fun, especially after you could see results of matches and before total automation, but I'll still have to deduct some marks here.
Theme- With reference to "Chemistry between the people" and ignoring the communication barrier this is quite a fresh take on the theme away from generic "Make this potion thing" or "Get gold" interpretation.
I'd also like nb people or people who prefer the same gender more often since they're quite hard to match currently.