https://scratch.mit.edu/projects/729053564/ Platform basics
Try my games

https://scratch.mit.edu/projects/634856232/ level-selectable tag

https://scratch.mit.edu/projects/600605892/ Catch the donut

1: For the platformer, the movement speed for your X-axis is too fast, and jumping is weird and slow. The Youtuber Griffpatch has GREAT tutorials for platformer games, Top-Down games, and more.
2. Your fish game is.., well to put it lightly, not good. Who uses abcd movement? You should use arrow keys or WASD instead. Pressing I think it was C, make your fish go beserk. Also, what are you catching, and how do you even lose your lives?
3: The catch the donut was kinda good, slight problem tho. The donut goes where ever your cursor goes, try using the "go to random position" block.
4. I kinda like the maze. The idea of having to press space tho was ehh. AND THE LEVELS. Again, Griffpatch is a great place to get started.
https://scratch.mit.edu/projects/729149738/ Platform game