Progress report: out of four areas (one of which is secret), two are completed and two are 30-60% complete. I may add a second secret area, but I'm not sure about that. Work is going extremely well, I'm very pleased with how things are looking.
One of the areas features the return of a once-famous, yet rarely used (?) tileset. I don't want to spoil a small level with too many screenshots, so here's the (admittedly abstract) plot instead. You find yourself in the Exit World - an abandoned man-made archipelago. The Concealment is a link between worlds, which you have to navigate while the demons are away, in order to get to the eternal Garden. Neither The Concealment nor the Garden are what they seem, and while the mystery of the Garden may be revealed to you in the end, the true nature of The Concealment will remain hidden.