This how good this is.

When I finished the first level, instead of going to the next one, I decided to play through it again, boss and all, because it was just so much fun. (And I was hoping I might find one or two secrets, but I didn’t.)

I’m playing on “Easy”, which seems to translate into “Mostly Possible”, and I am having a great time.

TIP: The Advanced Tutorial and gun upgrades found in level 00 are both very, very useful.