Very cool concept! Took me a long time to release what was going on though. I feel like the difficulty spiked way too early: level 3 introduced a bunch of crazy concepts which, while fun to figure out, was also pretty frustrating to figure out without any prior knowledge of how the game worked. I mean, prior to that level, you could win by just jumping! Suddenly you have to know how all these buttons work and that you can operate them from your past selves and that you can jump on your past selves corpses and so on: it's too much at once! The rules didn't seem to be consistent either: some levels seem to reset all of the elements upon dying, while other levels kept the elements there? Unsure if it was a glitch or not. Neat game and very cool concept, just could use some better level design to gradually introduce the concepts more intuitively, and some nice graphics couldn't hurt either to both fancy it up while also highlighting the mechanics more.