This may sound as if I despise the game, but this is far from the case.
Arknights v4.0.02 is a broken but rewarding idle game. The lack of quality of life features in auto-play seriously detracts from the game's daily 'fun,' but the ongoing steady progression, even when playing for free, is fulfilling. Every few days, I find myself actually playing a couple of levels of tower defense to check how my roster has progressed while also facing new problems. Check the
list of tower defense online games here for more exciting games.