Glad you like it!
I had an iteration of the game early on that was turn based with no timer. You'd get X (never quite landed on the right number) turns to clear as many tiles as possible. A full screen clear would give you a bonus turn, and finishing a level would add two more turns. Then I decided to be more faithful to the original game (this is a port of an iOS game I wrote 10 years ago) and maybe add different modes in a follow up release. Also considering a "very hard" mode with 4 colors which would add other types of specials like "simplifiers" from the original game that would reduce the board to two colors for a turn or two.
If you have any specific ideas for what you'd like to see, please let me know!