I'm glad you're having fun with it!
I promise there are no advantages granted to the Playdate - it's using the same code when it rolls the dice as the player. I think the difference is that its programmed to spot everything. There have been times where I'll hit B to roll again and notice I missed a better pull, but then that's part of the experience of the game. I remember playing this with actual dice with friends and being relieved one of them didn't notice they'd rolled a straight and only pulled the one and the five. I'm not saying you're making mistakes, just that the "AI" will not.
I considered having it make mistakes like humans would, but was worried this could confuse players if it didn't take full advantage of a roll that the player spotted and it didn't. That's why it will always pull all ones and fives, even if it would be more advantageous to take a single one just to have a better shot on the next roll.
The rules for the game are based on how I was taught to play it many years ago. I may do an update that modifies those rules to allow additional pulls.
Again, really happy you're enjoying it. If you have a spare moment, I'd appreciate it if you could rate the game!