I completed Stage 4 and tested it all out. Haha, it's 'puzzle' going to be rather evil, but I expect people to catch on easily enough.
Now I'm working on Stage 5, I'm nearly finished mapping, and I finished all the Midboss scenes. All that's left is to actually make sprites. Since this is Eientei, I need to make new cannon fodder enemies to replace the fairies of the last 4 stages; Rabbits. Fun, fun.
Stage 5's 'puzzle' is nothing more than a massive maze of corridors. Should prove to be rather interesting.
And to leave off. Have a screenshot and some spritework.
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When I finish stage 5, I'll update again. Later on.