For a moment there, I was assuming that this was meant to be a commentary of some sort regarding the irony of people wanting to be heroes allowing their greed to make them out as villains instead. Somewhat disappointed that isn't what we got, but I enjoyed it none the less. The sound design is lacking, and I have to point out the masking issue there was near the beginning (5:58). There were one or two cuts that were jarring and I wasn't quite sure what was happening in them. Now, I'll spare you any criticisms regarding the art and color. I'm a shit colorist and even worse artist, so I have no room to talk.
I will say I'm jealous of your ability to make a cartoon as long as this one based on a fun idea and with no dialogue. There are some great designs in here as well.