What an amazing concept! I love how you are your own enemy, and enemies are there to make you own bullets even more dangerous. Everything is clean, the art is really nice, the echo mechanic works impressively great, and the fact that the portal indicates the position of enemies is such a useful touch, and the timer ready for speedruns! What else? more various enemies could be an idea, but I must say I have no idea which type of enemies could be interesting while preserving the main mechanic. Maybe some enemies sticking to walls, quickly-moving slowly-shooting, which would force the player to shoot them and forget about the walls.. I don’t know, but amazing entry for sure!