Nice game :) A little bit too easy. It's cool to have another song starting at turn 20. The heal is very powerful when you have a lot of unit on the board. I didn't play with the guy who stole a card and with the tower cards. Be aware that on some cases our units can have the fire animation after pressing the "end turn"'s button. Maybe add a boss unit on turn 20 and on the last one. We don't know when the game end, so you should had it on the "turn"'s line, like : "Turn: 22/40" for example.
And I have an idea, but it need to make some changes, what if the units are always walking, but the 10 seconds count down is for the refresh of cards and mana ?
Anyway, I enjoy playing it, thanks :)