Unsure if I'd consider it a bug but I wanted to give the feedback. When paying the 20 water to lower the curse level in base, the performance of the game drops to an almost glacial pace if you press the "pay 20" button more than once in somewhat quick succession.
Also the mushroom upgrade exclamation point doesn't always disappear after buying all available upgrades with the amount of shrooms you have available (even reading all the prompts without buying doesn't remove it)