This game is great!! Feels like "Into the Gungeon" and "Binding of Isaac" had a Godot baby. Such a well made game and if you guys go further into making this an actual game, I'd definitely buy it!
Some feedback:
The bottom wall blocking the player was very annoying, lost a lot of my health due to not being able to see the enemy
Wish you could've had multiple upgrades and it gets very out of hand like Binding of Isaac
Ammo tracker could've been a bit nice, especially in the early stages
Player health not showing in shop, this would've been nice as there was times where I entered the shop, I didn't remember what my health was, so I wasn't sure if I should've bought a health potion and then left the shop. This then leads to my next point
Single access shop, because of my previous point, there was times where I just didn't get to buy anything cause I had to leave the shop to check my health
Not sure how the "it's broken" and "Through the teeth" were used in this game
Would've LOVED a boss fight after I had my 'build'
I felt like the shotgun muzzle was the strongest option, felt like I had way more projectiles and the range didn't really get hit that bad.
Overall, stunning game guys! Very well done!!