The lucky clover, donut and lucky dice do all stack! However luck is handled in a weird way so that a 5x multiplier doesn't make it exactly 5x more likely. It's mostly because I made the system in a dumb way but also to keep it somewhat balanced. It will be getting a remake post jam.
I definitely agree with the gameplay not being too interesting. It is one of the main things I want to improve during the rating period and the Steam demo release and I set the game up in such a way that I won't have to do much polishing, only more content and gameplay.
Thanks for giving feedback, I need more of this! ❤️