If you have the time and desire: Go ahead, make it better, no one can stop you XDD.
You can make part 2 of the game from the improvements, or add a menu where you can not only see the control buttons, but also enable innovations (showing the control buttons really helps to remember the controls, I have memory problems, so I often forget the controls in games, if they are non-standard or too complex). In any case, I will continue to play the game and return to it from time to time to shoot strange plants and monsters that are trying to turn us into fertilizer for the earth :DD