As the first of its kind it's a fun time waster. It's unfortunate that the dev doesn't have the mindset of a dev. Too much focus on art, music, new ways to waste more of the players' time.
There is so much potential but with every update the gameplay stays consistently bland.
I think it's awesome that he found success and is even making it into an anime. But I can't say it's a good game when it's missing so much.

•Pros:
+Consistently updated
+Fun the first time through
+Cheap, or free on mobile
+DLC is cheap and worth it for people who haven't completed everything
+Will probably be supported for a long time
+Infinitely replayable
+Thrill of discovery

•Cons:
-New content is added frequently, but wierdly the new content changes very little and is highly forgettable
-Poorly optimized, even with the new engine
-Glitches from day one still aren't patched
-Total lack of balancing, some weapons and characters are identical except one of them is objectively worse
-Weapons are designed for function and uniqueness instead of being fun