Good job for your first time, I would recommend you switch to the HDRP because then it would look a lot better and more like Dani's Karlson. You should also change the GUI, because right now it's the FPS microgame's GUI, your game is totally based off it. No offense, but you need to do better.
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Pro tip: if you want realistic Karlson movement, check this out: https://github.com/Legendized/Karlson-Movement-With-Wallrunning. It's a modified version of Dani's Karlson movement tutorial and the wallrun is easily customizable. You should really check it out! And if you want the shooting bit, just follow the tutorial from Dave / Game Development because he has 2 tutorials on projectile shooting. The second one is about the projectiles, so you could use it for explosions and stuff. And also don't use microgames as a starting point. Just make a new project! If you're new to Unity, consider following some tutorials first.
Sorry if I wrote so long. I hope this helps.
GG