Calculation of points is based upon the score value of each emoji that you own. You can find this information on the emoji collection screen. Select the icon of an emoji that you own from the set at the bottom of the screen, and the score value and level of that emoji will appear at the top of the screen. When you clear emojis in a match during play, this is the point value you earn for each emoji cleared. During Blitz, I believe you get extra points based on your level, but I’m not sure how exactly it is calculated. Coins are a different animal, and seems to be dependent upon how quickly you play, blitz vs. regular play, and match type. For example, I’ve gotten one to three coins for matching three emojis, but I haven’t been able to confirm the circumstances necessary to gain three versus one coin. I have noticed that the faster I play, and the more “cascades” of matching that occurs will result in more coins. You can also gain coins for popping balloons on the score screen at the end of a round of play.