I really enjoyed this one, but the design of the puzzles was a bit confusing at time, I think the problem is that, in some levels, there are many unnecessary reflecting objects that throw you off because you think you need to take them into account, but you don't. Also, the difficulty curve is a bit off, some early levels are way harder than many later ones. Btw, a hint option would be nice, but I know it would have taken too long to implement. I think the game is already very fun, the gameplay is addictive, and I really appreciated the inclusion of an option to change the echo's speed, I found myself using it a lot.