I really like the 2.5D style. I've seen entries that overdo it, but you kept it pretty simple yet good looking. Music fits really well. It took me a while to figure out the order of buttons to press to move on. Maybe the stones were a little too vague about the order, but it didn't stick out as something bad. The theme of Echoes of the Past is clearly communicated. You listed time as an additional theme, is there another mechanic that is time based? If not, I think it would be best just to stick with Echoes of the Past because that is definitely communicated through the game.
I made it as far as unlocking the wall jumps, but I couldn't get it to work. I could jump off a wall, but I was under the impression that I was supposed to continue jumping and I never could continue. Is that intentional or am I just bad at the wall jumping mechanic. I'm using a keyboard so that may be whats making it hard. Let me know if I'm missing something about the wall jump, because I'd like to continue.
Based on what I played, the only piece of critical feedback I think I can give is be careful about foreground objects that completely obstruct the player's view. I died to some enemies that were completely obscured and I had no clue that they were there.
Aside from the above, I think its a really cool entry and both this entry and Biker Stories communicate the Echoes of the Past theme really well. Congrats!