Solid game! I definitely enjoyed it, it reminds me of the classic Megaman games from back in the day, which was clearly your inspiration for this. I liked the idea of switching between multiple characters on the fly. I didn't find much use for the money, though, seems like there isn't a lot of things you can use it for that you really feel incentive to do. As for language, my knowledge OF Spanish not withstanding, I think it really harsh people would criticize the game due to a different language. Yeah, it would be convenient it be in English, but it's incredibly ignorant to say "No, you can only make games in MY language! Change it!"
That's all beside the point, though, This game functions well, the controls aren't as unintuitive as some might say, and the music feels remarkably retro. This is a new-age game that definitely knows how to do it old-school.