In order to collect more coins, you should try to always make as many matches as you can, because they will increase your score. This is a little something which I have found useful in helping me make more coins, but there is another way that you can do that as well - by making as little matches as possible and passing the level fast!

When you make a lot of matches: this is super useful, but it will use a few more moves than you would normally use when just going towards completing the normal level objectives.

When you make as little matches as possible: by doing this you are basically doing every move in order to reach the level's objective ASAP, but it can have a downside - you might not finish within the moves given if you don't try for some super tiles matched. Either way, if you try this, then you are trying to conserve the moves to get more points.

No matter which way you are trying to go, I still suggest saving some moves because they will turn at the end into special tiles and spread all across the board, which will result into more coins!