Nice game! I really like how the bullets are prevented from being spammed not by some game rule, but by the player not wanting to spam because of the danger they cause. The same with the shotgun, which is obviously more powerful, but also more harmful for the player.
It was tough fighting enemies when the bullets bounce directly back to you, so strategic shooting was really necessary. Being able to bounce bullets around a corner to an enemy really felt like I outsmarted the enemy, which is an enjoyable experience.
5 lives seems a good number for the game. I noticed that I played more risky in the beginning of the level, but with only one or two lives left I started to play really cautiously. That was an interesting dynamic.
The enemies being able to suddenly appear directly next to you felt a bit harsh. But maybe that was just me not using enough bullets to find them.
Final time: 5:45:06