The devs have put in some creative ideas. Mini monsters, missile launcher puzzles, mini bosses, etc. But there is a problem.
These aren't in older levels.
The devs need to put this in to the arcade levels. Dust bunnies in wolver dens, the puzzles in constuct levels, a randomly occurring boss fight in clockwork tunnels, stuff like that.
Of course, this would be in the Arcade Redux, so that means the devs need to continue that.
Some of the puzzles that were in the new core release level could be introduced to some other levels in the arcade as to let the players use their brain to get out of the situaion and not only brawn. Would be a nice addition.