Lots of game issues. Tiles switching places while playing and tiles being stuck or unmovable.
Also, there needs to be a goal other than how many times can you get to 20, not to mention that when I get to 20- it doesn’t tally on the top of the screen like it should. I think other than these bugs, the main issue is mathematics, you are unlikely to ever win (and even if you did, there’s no progression in the game) because the amount of tiles able to be on screen without a match at any given time and the amount of time space. Soooo, make some improvements and you have a fun game. Fix the bugs, goals and challenges and I’d recommend a larger tile space.