Thank you for trying again :) I've got my plan set for my next sprint.
The blue to coloured is a temp animation for the blocks being built. Building 5 of these will take 5 minutes and this is your 5 minute break in the Pomodoro cycle.
Knowledge isn't spent, only gained and is a threshold for blocks to be unlocked.
The Study Buddy is currently broken. I recently increased the placement resolution of the block and it caused it to break. I will hopefully get to this during the next sprint.