I loved your previous game and was glad to hear you were making another. This game has a lot of potential, keep it up! <3
Just a few concerns; need to nerf a few puzzles like the circle puzzle and "lighting up all the yellow stones" one. Because there's no way an average person can do them under 2-3 seconds unless they reset and get lucky and get a pattern that's semi-solved (2-4 times in a row depending on the puzzle they're doing). Not to mention a person has to drag their cursor all the way to a certain stone to solve and complete the game.
In my opinion, the memory game is doable. However, still really difficult.
As others suggested, make the puzzles easier, like giving the player more time for starters.