Great game, wish there was more of it.
My only gripe with it would be that the spikes' hitboxes feels a bit too bit, mostly for those that are on a vertical wall. It made me die with the feeling that I didn't touch the spikes, in level 6 and 7, which also created a clone, that made me miss the original clone that I was aiming for.
Other than that, really nice, loved playing it.