Playing zoomed out is a game changer. The resource management is pretty relaxed, which I like, and then the first boss fight really demands a lot of them! It feels like a good balance. Aside from the pink bug boss, feels like there's a lot of strategic headroom.
I was thinking of replacing the bug boss with an easier boss and putting it later in the game, but I'm glad you like the difficulty curve. I also need to tutorialise the bug-type creatures too: they have a dodge ability, which means if you attack one when it has an action ready, it uses its action to dodge your attack. I appreciate the feedback, super useful!