Very ambitious to cram a card game into this time period and resolution. I think the cards were astonishingly legible and I had a good time messing with the cards and figuring out how they interact.
I found the mana for card draw thing pretty punishing. It also leads towards just playing whatever cards you draw in order instead of making decisions between different cards with your scarce resources. Gods help you if you draw too many trees early. I'd rather have a fixed low mana cost or a re-draw that is free after a certain amount of time or something along those lines.
I could see a version of this where mana is actually super plentiful early, but hard to keep later so you have the feeling of setting up a terrarium and then trying to maintain it...
I'd love some sort of resolution controls, if possible. I found that your font choices didn't quite work at max res on my screen but I wasn't willing to play at min res either...