I really like the visuals, it took me some time to beat it/figure out the mechanics. I think the movement could maybe be improved a little by maybe adding more control to the jump height (coyote frames could also be good) and maybe changing the horizontal speed, to fit the vertical speed more (for example slowing the player down a little when in the air, but having them be able to jump a little higher, or lowering the speed the player has, but making it so the player keeps on sort of sliding (currently you just press the button and the player moves, but i think it would be nice if you pressed the button and then the player moved, but kept some of that momentum)), I really like the clone mechanic, but I think the clone should look more like the player rather than just a rectangle. I also think, since the player is a slime, that maybe some bounciness could be nice and maybe you should also be able to stand on the moving clone. When I walked off of the right ledge it would not respawn me, so I had to reload the page, I think music and sound effects/ambience/some more visual effects could also improve the game, otherwise it is a pretty nice game though. (Some parts of this are just suggestions, for if you would want to continue this game, since I actually think the concept is quite nice and don't really have an influence on my rating, since we did not have that much time)