Ares is pretty fun. It's definitely more Megaman than Metroid, though.
The upgrade system is pretty cool in that you just collect 3 different types of resources and then each upgrade costs a certain amount of each, similar to an RTS. And you can replay levels to gain more resources, or actually the enemies respawn as well, so you can farm pretty easy.
The graphics look a little like high-res stickers layered on each other, but that's alright I guess, as the game is just fun to play. It plays great with the 360 controller and has built-in button assets.
The sound effects and music are pretty good.
There's no real story to speak of, and the first episode appears to have 5 levels that can be replayed.
All in all, I'd say it's worth it, if you enjoy these types of games.