This was a fun play! The BoI-like shooting was very responsive, and the needle mechanic was really inventive! It was really hard though, perhaps unreasonably so? I have no way to knock the enemies back and they can attack me from anywhere on this small map, so even if I see the attack coming from miles away, there is still a very high chance that I get hit.
I also think that the waves should be longer, with a buy period after every wave, rather than small waves and a buy period every few waves. I think it will make your game loop a lot clearer to the player. I thought the card mechanic wasn't finished in time, until I eventually got to wave four.
Other than that, a great submission! With a slight rebalancing, it could totally be a full release!