Is there a way you can have the game ask for more Ram? My PC has a lot more open RAM but crashed at 60m in height
That's not how this works. Game uses probably as much memory as it needs. Just as 9 women can't make a baby in a month you cannot expect expect a game to be able to use more memory just to work better. If you have a specific bug you can provide reproduction steps for you can just put them in your comment and the dev will probably look into it.
The only way you can have not enough memory is for the game to literally start using paging file but that can only happen if your RAM is full. If your memory is not full then it's either CPU or GPU problem. No program is going to lag because of not enough memory unless the computer has to do transfers from slower memory.