Good concept, but the janky buttons and bugs knock a star off for me.  Could maybe use a bit more card/enemy variety as well.  I'm curious if anybody has actually beaten Alchemist 3- I rolled up with max queue, max HP, four queue swords and four queue shields, and all 7 bonii, having steamrolled everything since about  the fifth sub-boss, but got absolutely dunked on.  I'm not sure how possible it is to improve on my setup, so that seems like weird balance.