Wow, that was fun! I finally beat the alchemist B)
Balancing these kinds of games is really hard, because there's a very exponential power curve, and if you fall even a little behind, you die, but if you get a little ahead, the game is trivial to beat, but I think this one does a pretty decent job. The last 2-3 levels were just me skipping through with nothing to buy because I was too strong, but until that point there was a lot of interesting decision making! A way to mitigate that could be to add different enemy types - some that deal extra damage to armor, some that reduce the damage they take, stuff like that.
But I think with some polishing and some animation, you could have a totally commercially viable game here, I enjoyed it thoroughly.
One bug I encountered was I increased my queue size to 7 but only had 6 cards in my deck, and the game just broke.
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Yay and congrats! I'm glad you had an engaging run through most the game.
I would LOVE to spend more time doing exactly what you describe: more enemy diversity, more card diversity, etc... as well as polishing up the non-mechanics parts of the game like art and animations.
p.s. Thanks for the bug report!