Grats! The baubles that trigger on specific hand types should all work, assuming the scored hand contains that hand type. The slinky only triggers on hands that contain a straight flush, which is defined differently than what you're describing, but it certainly is possible. You can get the slinky to trigger on a flush five by having four plastic bricks and four snakes, then effectively every hand contains a straight flush. I get that a 'flush five' sounds like it should count as a flush, so if you have four snakes I get how it would make sense to expect slinky to trigger. I will ponder on how to make this clearer to the player.
I'm not sure I agree that four of a kind should count as two pair, a part of my brain thinks that makes sense but in poker terms they are quite different. I have plans to make those baubles (the two pair and full house one) more powerful, though.
Thank you for your feedback, and I'm glad you're enjoying the game <3