Very cool

this was a very decent song, but I do reccomend adding in 1 or 2 real instruments with the midi bass staying or vice versa with the lead. this will give it diversity, strength and make people wanna focus on the song more than the game lol. your really onto something, just give it that extra oomph!

This really sound more of a level track rather than a boss theme. Aside from that, this has a pretty nice tone and feel to it, though the use of MIDI is a bit ear grating (really, get some VSTs or Soundfonts) and it gets quite repetitive for such a short track.

The lead melody is genuinely very catchy, though I really wish you'd done more with it.

this got me pumping! bring on the boss!

It would help if it didn't sound like a MIDI that was directly converted to an MP3. Use some SoundFonts or VST instruments, man.

And keep trying. This piece doesn't quite cut it for a boss theme, but you're getting somewhere.