Quite the hard game! I love the aesthetic and music, and the idea is very cool. I felt like sometimes the picking of the cards and placing them seemed a tad inconsistent, however that's more a nitpick and something that can be patched easily. Maybe adding some sounds to when the timer is running out would be nice so players can hurry up if they need to. I think with a little bit of balancing (I feel like the bomber minions hurt themselves and allies far more than they hurt the boss) the game would feel a bit more fair. The art is absolutely beautiful though, can't get over it!
Very well done :)