Great game with a stellar soundtrack. Slowly uncovering more and more secrets and the unexpected ways that the game open up made me keep playing. The puzzles were good too. The difficulty scaling was just right and I liked the decently challenging endgame puzzles. My favorite parts were Mon's domain, the DIS part and NG+ itemeless. Most of the puzzles felt fair and doable but there were a few bullshit ones. For example, the room where the solution was to just pause four times. On the other hand, some of the secrets in this game were a little obscure but I did figure out most of them on my own. For the stuff I wasn't able to figure out on my own I had a blast discovering new things or just discussing the game with other players.
After basically doing everything the game has to offer I still crave more. I can only hope we get some updates or DLC at some point...

Oh yeah, fuck the shmup stuff.