Really really cool concept, loved the twist on the genre.
The visual are really cool and i love the music and the way it was integrated (specially the way it start back after chosing a card)
Very good job on the polish and the gamefeel, the way the numbers of surviving or score go up is so satisfying to me.
Btw my hightscore was arround ~24.000 but my game crashed wave 19 due to hundreds of soliders exploding at the same time lol.
Your game deserve way more visibility imho.