I had hoped to implement things like holding down buttons alongside your past selves to open doors and so on, but didn't get around to it. The game idea relied a bit too much on level design to be manageable on my own in the limited time available, I think. Thanks for the feedback in any case!

That's a bit worrying, the game ran smoothly in my testing, but I admittedly didn't check it on anything else but Firefox.

As for the gameplay, you're not missing much, I ran out of time. As is, the game ends when you smash three gems scattered around the world in a single run. You have to dash through enemies and previous iterations of yourself to be able to make it in time. I'll add hints to the description when I get around to updating the itch page so that it's more obvious.

Thanks for checking out my submission!