Thanks for the feedback! I agree about the jumping, I went back and forth on it, if I got more feedback before the voting period I probably would have changed it. I also originally had the first upgrade right by the start, but you wouldn't be able to equip it until you got 20 points anyway.
As for the upgrade menu, Enter and Esc can be pressed to close menus. Also the start button on gamepad. The continue button exists as a way to close it if you make changes, otherwise you can press a key :) It's on the page in the controls table.