Thanks! Yeah that's a great idea. Making the player feel good when they're doing good is always great. Even if it is just some oomphy visual and auditory feedback. I was a bit afraid about the reception since they game indeed is slow in gameplay and mainly about just planning for the whole game and then watching it unfold. It seems to take a certain type of player to really enjoy but at least the feedback is mainly positive.
For the record, I don't think your game is far from being $0.99 on an app store or supported with in-game advertisements. Seems incredibly replayable. Maybe switching from a square to a vertical rectangle for level formats, and maybe some concept of progression or at least being able to clear tiles when you clear the deck/move on to "the next level" and all of a sudden this is perfect for mobile.