An interesting twist for an idle game. The combo mechanic was a cool idea, but in practice, once the cookie reaches the edge of the screen, you're not clicking the crumb it shoots off screen in time to continue the combo. And once multiple cookies get introduced, the mechanic goes out the window.
Clicking the crumbs was a little fun, but I found myself constantly wishing for a click size upgrade or a crumb size upgrade so I could collect them more reliably. The upgrades that passively upgrade crumb production were my favorite. The Magnet Field didn't seem to help very much, and it was weird how both it and the Slow Time upgrade had a limited number of uses.
I would suggest making the crumbs a little bigger by default, as I gave up collecting them many pretty early on. That would make it even more fun.