Great classic console vibes. I made it to level 7 on my last run, before the unexpected fireball killed me in a doorway. I got several achievements, but only 1 almanac page.
It was fun trying to figure out each new enemy and the best way to deal with them. The one that caused darkness when defeated was quite the surprise. I started by collecting and destroying everything, until I ran low on ammo. Then I was a bit more careful with ammo and skipped blowing up some boxes or activating the Vulcan (in game the killed by message looked to be spelled "Vulvan") Cannon.
Overall this was a nice game, and felt like playing a classic NES era game.