I did notice that a number of tunes had pretty much everything right in the middle (mono), which is good to a degree, especially for big systems, but some stereo separation can help add flavor and richness. Obviously you don't want to do this with the bottom frequencies, but mid range and top end basslines, effects, even hi hats do really well with a smidge of widening. Maybe try a touch of sample delay or general panning of hats or some intreresting, subtle delays for top end basslines in the future. Assuming you have the synth Massive, there's an effect on that called Dimension Expander that's really cool on mid/high bass sounds but ONLY if you use it sparingly. Too much of that can easily ruin a sound. Another cool trick is to use something like Ozone's multiband stereo imaging suite, where you take a stereo bass sound and divide it up into 4 frequency ranges. You can then set the low end to mono, the lo-mid to mostly mono, leave the mid untouched or add slight width, and then spread out the very top for a nice, wide effect.
Other than that, everything sounds well produced and pretty phat. Definitely dig the Nintendo sounds mixed with the rough basslines.