Intro is pretty much fine, but kinda basic. Takes a little long to get things going, but that could just be my taste. I would love to hear a more prominent melody in this. So far, all we have are harmonies and drums. At about 1:30 we finally get a more noticeable melody coming in.
A few of the drums feel a tad out of place (some sidesticks and such). Might want to either change those up, or find a better place in the mix for them. They just feel so odd when they come in occasionally.
At 3 mins things seem to be going nicely, but I would have loved to have heard more variation by this point. A section or two that is different than the rest, especially since this is a video game song. Remember, it's far better to keep it simple and not just try to get a 6 min song. Sometimes you can do more, in far less time (3 mins is usually more than enough).
The mixing is good, no complaints about it. I would just recommend more variation is all. I would suggest to chop about 2 mins out, and throw in 30 seconds of a section that stands out as an intermission.
Good stuff, but needs more refinement, and less redundancy.