Awesome work on this! I had a good playthrough against myself trying to find good strategies. It seems it's best to stick to two colours of ingredients and focus on the grow spells. There doesn't seem to be too much of a reward from growing your economy with coins to try and save up for the 3-pip ingredients at the moment, I'm not sure how to fix that but you could try and play around with their costs?
Fantastic Dominion inspired game, again, fantastic work!