I misunderstood the Lovers Survive achievement at first, and beat the game without killing a single gargoyle. Oops.
I have all the achievements now, but thought I'd share a funny moment.
Really fun game! I used VGVubmVycw== to solve it, but I think I misunderstood how Yellow worked. The rule I came to the conclusion was dGhhdCBpdCBoYXMgdG8gaW5jbHVkZSAiRVJTIg==, but if a word like cG9wY29ybg== works, that rule completely goes out the window.
(Every instance of jumbled text is Base64.)
Edit: Oh wow, I think I know how Yellow works now, and I misunderstood it more than I originally thought. Huh.
All ingenious, only one I couldn't solve on my own was the coins puzzle. I got the 4 move solution, but couldn't figure out a more efficient solution. Looked it up, utterly brilliant.
As for the other two, I can only thank Ted-Ed for teaching me all I needed to know to solve the other two. Now if you'll excuse me, I need to go rewatch some riddle videos.
I spent a good five minutes routing out the entire path for the final level (after accidentally hitting x the first time I beat the game) just to realize that the character physically can't move to the right there. If anyone's curious, the move sequence is as follows: L L L L L L L L D D R (First block in place) D D R R R R R R R D D D L L U U D D R R U U U L L L L L L L U L D R D D D L L L U U R R L L D D R R R U U U U (Second block in place) D R R R R R D D L U R U L L L L L U L D R D D D L L L U U R R L L D D R R R U U U L U R (Third block in place) D R R R R R R R D L L D L U R U L L L L L U L D R D D D L L L U U R R L L D D R R R U U U (Final block in place)
I'm not entirely sure if this would work, but I believe it would.
Actually, I'm gonna recreate this level and see if it does. It's gonna drive me insane not knowing for sure if it does work or not.
Edit: It does in fact work. At least it works if you exclude the fact that the character can't move right.