Overall, a good listen. Though I noticed a few issues.
Issues:
-the song just starts, not really much of an intro
-there seems to be a timing issue at the 3 sec mark, not sure if that was intentional, but it just sounds off
-I'm not a fan of the first lead, which plays through most of the song, the guitar sounding synth, it feels subdued, almost buried, perhaps too much reverb, it also gets to be grating
-the bass is a bit overpowering at times, for example, at around 0:35, also at around 1:22, the temptation is to boost the bass, but it's easy to overdo it, which you have done here
-the chiptune parts sound sporadic, they come in for a few seconds then disappear, which happens several times
-as for the drums, the kick seems to get buried, I mostly hear the snare, and the timing of the hats sounds off, they don't really fit with the kick and snare, really noticeable in the first 15 seconds of the track
-the song sounds muddy, too much going on I think, really pay attention to separating those frequencies, especially during the busy parts, they sound like they're bleeding into each other
-also, needs to be longer
-a better transition to Heart of Fire would be a good idea as well
What I enjoy:
-the backing synth that plays between 0:17 and 0:38, and later on
-the organ was a nice choice
-the 303 arp has a nice sound to it, though it could stand out more
-the current arrangement is a nice variation on Vampire Killer
I think this is a good start overall, but does need work. I hope my feedback helps! Keep up the good work!