Yo I finished the game! (like I actually reached the end) the gameplay is actually really interesting & kinda fun, I genuinely love the concept of a tower defense deckbuilding game, I think it has potential if you want to develop it further.
Turret placement is a bit... finicky let's just say. If the enemy breaks through your defenses you're just waiting for a slow inevitable death. I would definitely prefer a drag & drop system so you can pick where you want to place the turrets, or maybe an indicator on where the turret is going to be placed next.
Overall it's a very nice little prototype, I would defo want to see this developed further! Cheers.