So what this boils down to is a classic-style action adventure (with some puzzles to be solved). Gameplay will take place on a large map, with each screen representing a room to be navigated and explored. The game is not linear, but will require you to seek out both new and old rooms to complete your tasks. There will be items to pick up and use, as well as a variety of power-ups that may help you access new areas.
That's all I'm willing to give away for now - I'm currently working on the master map for the game and trying to pin down the best locations for items, bosses and power-ups.