Just because people don't respond doesn't mean they don't want to collab. They might not know how to add what they want to add or they don't know what to add.
By the way, I can do square collision, not the one where you collide with a sprite in the shape of a square but the one where you make a square-shaped hitbox using coordinates. If you know the formula, we can even make objects bounce depending on a bounce variable and how fast the affected object collides with something.
Shouldn't the "collisions?", "gravity strength" and "gravity?" variables be local? If they were local, you could give each sprite its own gravity strength. You don't need to add that, I will.
The pin is 068944. No password is needed, it isn't like we can hide one. I'll smerge my changing once I'm done with them. Please do not expect it to take a short amount of time.