Ok, I have couple mechanics ideas. Things to implement, in order:

-animated Sprite class
-tiles
-map loading ( preferably I would use PNGs with pixels for tiles )
-gameplay
-menus & text displaying
-enemies
-app structure ( intro, menu, level load, play level, level load, …, game over/won )
-animations in
-audio in

And here’s a mockup level and updated Gobos model: