You might need a thick skin for some of these... They're all meant constructively though. Try to learn something from each of them so you can avoid them next time. These are all from memory, and I've reviewed several games since yours. Might have some mixed up from other games!

• Gun repeats every frame, which makes a terrible noise!
• Gun doesn't have much juicey feel to it
• You die way too easily from the enemy shots
• Doesn't reset when you fall off the world (I know you can manually press R, but why not just stick a limit on the Y height or a big collider below the level?)
• No mouse invert option, makes it really hard to control for old-timers like me
• Controls aren't shown on-screen
• It's really slippy! You can fall off ledges way too easily
• Does it want to be an FPS, or does it want to be about parkour? I woud lean it way into being about jumping and wall running if I was calling it Parkour King, and not even try to do guns. It's a games jam, no time to focus on several mechanics. Just concentrate on getting one unique mechanic nailed. You can always explore that mechanic thoroughly if it's rich enough.

For your first 'real' game, it's really good!