Yeah, I was sad to the core for the next few days, that the lock did not explode, whenever I unlocked my flat's door. Well, not really. ^^ While the exploding blocks were mostly the result of limited time, I really like how it turned out and have to agree, that it makes the gameplay more satisfying. Probably will keep it this way. I'm also happy to hear that you like the tutorialization of the portals. Heard from multiple people that they didn't get it, though. So I'll probably will tweak it by letting the player pick up one key per color before walking through the first portal, so it really becomes crystal clear, that a portal destroys everything but the own color.
Thank you for playing!