they mean in the winning screen. If you try to upgrade a star potion in the winning screen (exchange, upgrade, duplicate) it disappears
ah, ofcourse! Very sorry for the misunderstanding
yeah the reward screen is one of the rougher parts of the project - in the long term I could see me giving it a total overhaul, maybe turning it into more of a shop, but in the main time I'll try and give it a touchup to make it more stable
