Fairly short game. Took about 3 hours of play time, 1.5 hours of clocked time as it summed my level times. It felt a bit easy with only the more basic enemies in the first few levels, maybe as many as 6-8, but once it introduces the real threats, things get challenging. I'm glad I pushed through the easy phase as I started to waver a bit. There are a couple of decent secrets in the first half dozen or so levels, but after that, they're pretty easy and not often very hidden. Would have been cool to get some good secrets later on, but that's a minor gripe.

Very good, perfectly paced and an excellent departure from its doom source.