Thank you so much! Yeah, we had "update the color of the costs to match how much energy you have" as a checklist item but ended up needing to prioritize a few other things to get it out on time.
As for the complexity, yeah, there's definitely not a lot of time to balance a bunch of cards in 48 hours, so we wanted to focus on making sure each fight was winnable. Still, I struggled to remember the winning combo for the third boss even after making sure you could guarantee a win with the right order lol, so I guess it can get pretty challenging. More fights with a softer difficulty curve would definitely be ideal. And we can't make any promises right now, but if we do expand it we'll make sure to let you know.
Glad you enjoyed it!