I like this, but yeah, the skulls in the compo version are way too hard. It felt like it was mostly up to luck if i'd be able to clear any particular level -- several times there'd be like three or four skulls coming at me in a row, each one almost impossible to dodge (specially with the field of vision reduced..). Just one skull wasn't too bad, but they had this habit of ganging up on you.
(The skulls in the post-compo version are a lot better, but they're almost too easy again.. not the skulls themselves, but i think they take off less health, or you get more health from the stardust, or maybe there's more dust? either way, you recover pretty quickly even after getting hit)
I wish there'd been more variety to the levels. Maybe i didn't play far enough, but they pretty much felt the same. I think there was a bit more debris in later ones, maybe? It was pretty subtle though, and as for skulls, i got a ton of them in level 1 a few times, and only one in later levels other times, so that seemed more up to the random number generator than the level.
I liked how some 1x1 corrupted blocks looked like corrupted skulls. I don't know if that was intentional or if i was just seeing things, but the first few times those went by i was wondering if they'd suddenly wake up and come after me. Would've been nice if some of them did! (Well, not *nice*, but, you know =))