Go to the jade bishop gate and try a clockwork tunnels level at depth 19 or 20. Fight your way through the whole level. See the problem?

Perfectly nice for a construct-themed level, since it's almost exclusively constructs. But the levels are supposedly gremlin-themed. There are a few darkfang menders, and that's it for gremlins.

For the Jigsaw Valley levels that don't have the mobs change with the theme, I can understand that. But clockwork tunnels levels have the same map segments with different mobs that depend on the theme. Except that the gremlin theme is almost exclusively constructs. Change that, and put some gremlins in.