Opening the exit portal by destroying the copies of yourself was something I haven't seen before. It was confusing to figure out how to solve it in this setting: you move around like in a platformer.
I think this game has potential and it would be better in a turn-based game format. Something that let's you move tile by tile, one step and everyone else move one step. This way the movements will be more predicatable and challenge the solver to think of series of actions in order to solve the level.
One thing I'd also like to point out is the game resolution, it is tiny, maybe it is just me because I am in mobile browser. Regardless, you did good in this jam, good luck in your future growth.