I have just updated the page with a walkthrough video I was working on if you feel like trying again :) I bet the 2 minute 18 mark is what you're looking for.
I should have included z and x for the arrow keys, my mistake! The Start Button key also close the upgrade menu and tutorial view, either Enter, Esc, or Gamepad Start.
Thanks for giving it a try!
There was supposed to be. Originally I wanted to have it so that by getting all 4 you can ascend up to the door, but I ran out of time to do level design so I had to scrap it and make an alternate path. There is a hidden points area that leads to a second hidden points area, and the second is inaccessible without the 4th ability unfortunately.
