Thank you for your feedback! I will check out the issues that you mentioned. The equipment and inventory window should be able to open at the same time but I can double check.
I made this project in unity and yes the scroll windows can be kind of funky which is a unity thing and unless I design it different I can't really do anything about it. It should work properly though.
If the game doesn't run smooth it might be a PC issue. I know the game can be slow on older models. However if you have a new super speed computer and it's still slow then I'm not sure:)
I will check everything else you mentioned. Thank you for taking time to write some feedback!