So much effort, great job!
I had some trouble figuring out how to play, as if you move the bullet not fast enough, the drag will just reset, and it's not obvious if it's intended or not. But after learning to quickly fling every bullet up, it worked for me.
Everything apart from the frog boss felt like no decision of mine had any effect, and after a couple of fights I was hoping to get the "just charge them all and fire at the first enemy" button. The rolling barrel contributed into that feeling, since everything seems to be shot at random in a Russian roulette fashion (but that was my misunderstanding, as I got on the final fight). With that insane dodge chance (is it around 80%?), there is no room for strategic planning to "stun-heal-attack", as both "stun" and "attack" will most likely miss.
It's impressive to see a multi-screen deck-building game made within a month, though, keep it up! ¦3