Algemy is actually a pair of games. The first, “Algemy”, was released in March 2018 and offered just over 2,000 puzzles. The second, “Algemy 2: All Gemmy”, was released in December 2018 and offered just under 140,000 puzzles. [Due to Google Play store rules, the first game no longer exists on Android, but the second contains all of the content that the first one had anyway.]
In both games, the goal is the same: Fill the board with colored gems such that no cell is empty, no gems illuminate each other, and each target is lit by the appropriate combination of gem colors.