For a game made in 3 days, it's well polished! I really love what you did with the particle effects and the atmosphere of the visuals:)
Some janky unity spacebar physics but it's alright since I barely needed to jump! However, I noticed the bullets when you shoot multiply if you successfully hit something that's not part of the environment (e.g. enemies, pots, dandelion(?)) not sure if it was intentional, but it felt good using the gun I like the sound and crosshair!
Enjoyed it, it's a good prototype for a game, hope you try working on it in the future!