Hey there!
Good effort overall! Congratulations on finishing your first game <3
I make platformers myself so i am usually a harsh judge on those. Since this is you first one, i ll note here some things i noticed so that you have them in the back on your mind and try to improve on those. Dont hate me about it! I liked the game, i just noticed a couple of things and i think it will help you get even better.
First of all the buttons chosen for the keyboard controls are really hard to play with. I would recommend using Q,E,Shift,Space for the controls or even keys like Z,X,C,Space. Those two combinations are much easier for people to use.
Another thing is that the game was very unforgiving for example in the first level were you need to fall and collect the two screws that you cant see when falling. If you miss you need to restart. You can implement a system where you Clamp (limit) the maximum fall speed and even make the camera move a bit lower so the player can see where he is falling at, and have the time to collect those. You could also make a couple of platforms so in case he misses them, he could go back and jump up to get those, costing him time instead of a hard reset.
Point three, is that the character sticks at walls and platforms. You can easilly fix that by adding a Physics material on the player’s and wall’s collider that has 0 friction. This will make the player fall instead of sticking.
Last thing you can try to implement a jump buffer and coyote time mechanic to your controller to make the controls feel a lot better. The first allows you to press jump while not grounded but close to the ground and your player will still jump when he gets grounded and the second allows you to jump off a platform for x amount of time, even if you miss the jump slightly, so you can basically jump for a while after leaving the platform even if you are in the air. Those 2 will improve the controls immensely especially for a platformer.
Your game was a bit hard, but really fun to play for me! I hope the advice above helps you! Keep up the good work!