Thank you very much for writing such elaborate feedback and playing my "game! It´s more like a vertical slice though :D
I'm 100% certain that the game is beatable, but requires kind of precise jumps. Especially the last section before you go up in the first level. First 6 jumps are possible with normal jumps but the following 3 need "Slide Jumps", so that you can cover more distance. The trick for the third level is that you have to hold crouch, slide the whole way to the end and time your jump inputs to cover the distance (That´s where the funny mechanic comes in). I tried adding "strafing" while in the air but the result is so tiny that you don't really notice it. You can press s while in the air to slow down and try to not overshoot the platform.
The funny mechanic you mentioned is just me forgetting to put a speed cap on the slide xd you get a speed multiplier when you jump and/or enter the slide. These just stack indefinetly lol But i thought it could make for a funny/cool gameplay feature and just kept it in. Made the whole third level with this in mind.
The crosshair part is valid. I'll definetly add one.
I wanted to make it more polished but really overestimated what i'm capable of in that amount of time. I think i'll make it more flashed out once the voting period ends.