So I found all the armor pieces and got to the two tentacle hammer dudes on that GIF. Combat is good, once you add more weapons you'll have a bunch of different playstyles. Pipes puzzle in the mountain smithy was also a pretty good , requires some thinking but it's not annoying. The Illustrated guide book was cute.
I did most of the hard encounters by strafing and shooting with the crossbow, though. Even with the reload time, you should probably also limit the ammo. It allows you to basically avoid having to learn the enemy patterns so you shouldn't be able to rely on it.
Overall the systems are already solid, now it's time to build up that content!