If you don't see what im getting at, imagine this video, excpet with the generic dungeon replaced with a ruin tileset, the character(s) being Megaman, the enemies Reaverbots, and "buster-bullets" being fired from side to side.7
To tell you the truth, I can see it now. "Open up your menu, click attack, choose either buster hun or special weapon". "Open menu, click inventory, choose energy canteen, hyper cartridge, or chameleon net". Since MML is an action RPG, to me, and RPG such as the one in the following video is the most logical of choices.
Plus it's easy. the engine's already there, and we can even just use stationary drawing! If we were to use this, it could easily be a quality product in under a year!