Oh my god thank you for actually beating the game! You're the first person to do that!
I agree easing the player into the levels with a tutorial would be a good idea but I made all the levels and stuff on the last day so I was trying to gradually demand more knowledge of each mechanic in each level with a tip on the main mechanic of the level at the start with the idea that the player could go back to the beginning with everything they learned and go faster.