These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
The soundtrack for Vampre REX was done by Shibayan Records, while the soundtrack for Jade Penetrate was done by Saitama Saisyu Heiki, which accounts for the drastic differences in the styles between the two soundtracks. Both of them are still awesome in their own ways.
The soundtrack for both games can now be purchased from Bandcamp.