You doing good dev.
I here to suggest a better control for the game.
Keyboard + Mouse
The 1-4 keys are for each heroes, just point at the target with the mouse and press the right number.
Controller
A, B, X and Y is for each heroes, targeting the enemy is use the left stick, you notice a crosshair that helps to aim more easily.
For supporting a other hero just hold the trigger or bumper to go āSupport modeā,
during the support mode you have to press a button to select a hero that can heal, boost or defend then press a other to select that hero to give support.
If I had to guess it must be by manipulating the script that can be edited in the developer tools, at least from what Iām thinking. Why I say this is that you can change the variables and whether certain levels are open or not and more, I donāt think itās a stretch to say one can add things as well (or remove them as needed).