Very cool way to tie into the jam! Despite only having 3 keys I love how you used them in the levels. There is a lot of leeway for error to keep it from being way too intense so I didn't need to bust my brain out thinking out to allocate my resources to the point of it being perfect. Great job!
I think I also got the issue where I finished all the levels but when I was back at the main menu I had only unlocked levels until the 6th.