Tried to play your game for a bit, but it seems like you had the transition time between scenes set to take like, a full 15-30 seconds, so that every screen transition, even on the main menu, took almost a full minute to fade in/out of black.
Viewing post in Dark Alchemy jam comments
The transition times were set to about 1-2 seconds in general, but a confluence of issues I didn't notice until far too late made it so that every time it attempts to fade something, it causes a massive lag spike. It isn't even like a "oh, if I changed this one thing, it magically clears up" kinda thing, it's "my methodology around the UI was so completely wrong that fixing it would take significantly longer than I had time for." I learned this at the last minute because for some reason, the "XAML Hot Reload" setting in Visual Studio being on while testing made the issues not happen at all, which made me think there weren't any issues. I still have no idea why XAML Hot Reload causes those issues to disappear. I have some idea of what causes the lag, but I genuinely have no fucking clue why XAML Hot Reload being on stops the lag from happening. It baffles me to no end. Some of this is due to the architecture I was using not really being meant for games (Microsoft's Windows Presentation Foundation), some of this is due to me not being familiar with it when I started this, and a good amount of it is honestly just due to me being a complete dumbass. I'm sorry for wasting your time.