I beat the game.
The game is fun. The gun fights feel right (probably the good speed of the protagonists and bullets especially) and the gameplay loop works, walking between the shops and trying to be a bit conservative with using your ammo. During the second part you can take your sweet time to collect ammo for sure, but the meat of the game is in the first part anyway, and in this one the difficulty seems about right to me.
Fun game, thanks for sharing.