There are some great ideas in here, but I'm forced to agree with one of the public commenters - the boss regenerates too quickly and/or it's too stingy with coins. (I feel a bit weird trashing this, because the idea of having to do a task to 'reload' is a good one, and having a boss that can heal adds a little urgency, which I like, I just feel like maybe it needed a teensy bit more difficulty tuning).
(I may or may not be a filthy casual, so please take this with a grain of salt.)
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I think you're right, the difficulty is probably over-tuned (classic problem of the dev being too good at their own game and not doing enough testing before release). I'll try and update the difficulty when I get some time and hopefully that will improve the experience. Thanks for checking the game out and giving feedback!