Ok so I was extremely confused while playing this, then I read the comment you made and a lot of stuff cleared up, like the web towers only working if they had another one connected; I thought they just weren't working or something.
I kept getting cards to upgrade the chain towers while I only had cannons and weren't sure if they were the same or different ones before I got the web tower and then realised there were more towers in the game and I just had a bunch of actually useless cards in the deck just taking space.
Also the fact that the cannon uses projectiles instead of hitscan was extremely annoying at times when I thought I couldn't possibly lose and they completely missed all their bullets, I probably should have positioned the cannons better but some maps you just have to rely on rng entirely.
I did have fun in the end either way even though I didn't understand what was happening a lot of the time, the visuals look nice, audio is great, I especially like the game over screen; really cool looking!
I think it would've been good with some sort of tutorial to explain how the game works.
I do think you should keep working on the game since it has great potential and I would like a more polished version.