I couldn't get past the blue wall. I'm probably just an idiot, but clicking on the wall did not work, sorry :(
No you are not an idiot i just think i needed to signal more how the mechanics worked
btw : you need to get back in time to break those block and also what the mages says to you can guide you to how to solve the puzzles
you just need to go in the past using the directional arrows, the violet npc gives you a tutorial when you go close to him (past or presenty doesn't matter) ^^
Don't think you're an idiot we didn't paid attention on this particularly ^^