Fun little game, I did something similar, with three characters, but yours is better, more dynamic. One suggestion, I used the same background, I recommend you do some parallax with the layers of the wood and use opacity on the sun rays, check out Bunny Runny for an example of that.
Great to see a local multiplayer, simple controls, I get this will be fun. Need to extend to controllers for some fun couch multiplayer. iDarb in the gfx simplicity.
Nice story and background, the bullet hell is nice, with a good twist coordinating the color to the type of enemy and your vulnerability to the other types of enemies. Retro graphics are nice also.
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