The advice from Yorsh sounds good to me. And we also ran short on time, even without a puzzle game! So I think it's pretty universal haha. Another way to implement the AI could have been to just completely randomize moves? Although I don't know how long that would have taken either. In any case, this seems like one of those simple to learn hard to master games, and I'm super impressed that you were able to come up with it and even get it as implemented as you did within the time frame. This is one of the most complete feeling games I've played this year, I definitely think this warrants more work, if you wanted to keep developing it! Really good job!