I really enjoy the game, but you really need a way to explain the mechanics of the boss battles better. Those were my absolute least favourite parts because I had no idea what I was doing wrong. I kind of got the hang of the Frozen Boss after a few tries, but the Molten Boss seems to just instantly drain my health before I can even figure out what cards I want to play, and the flames make the target number almost impossible to make out. If the mechanic is that you need to make the number higher, then that feels like it runs counter to the mechanics already established and needs to be reworked, or at the very least communicated way better so that the player has a decent idea of what to expect. Even so, I don't like the idea of having to throw out my entire run of cards up until that point because the aim of the game decided to change for a single round.
Yep! You are completely right. We have actually already revamped all the bosses and added new bosses in our latest playest version which there is currently a public playtest on itch! Would love to hear your opinion on the new boss designs too! https://kaolver.itch.io/null-rush-version-02