The DPS build I made was pretty fun, it reminds me of some of builds I had the most fun with in Holocure, one of my favourite games of all time! Neat Survivours-like!
That being said, after a while I just... wasn't picking up upgrades? They stop the flow of the game dead on its tracks, giving me more stuff that I had in order to deal with the same enemies as before.
I don't know if I'm saying anything that other people haven't said here. Maybe an original thought I could add is, you don't necessarily need to remove the many books on the floor. But instead make it so that you select a "loadout" like in Survivours, and then everything that drops afterwards gets autopicked, doesn't stop the gameplay, and buffs your entire loadout by 0.1. Something like that.
Good job, was very enjoyable despite the flaws!