Hey RetroBananaMan! Thanks so much for the kind words! We really wanted to make something very satisfying to play, so we're happy to hear this worked out for you! Regarding the music: I'm very glad you enjoyed it, I was really hoping for people to have that "oh shit" moment when they hear the beat coming in.
Too bad it didn't loop, I thought I tested it but maybe it broke somewhere near the end of development, we'll check it out. It was supposed to end when you die however, but it might be better to just keep it looping so you can keep on restarting with the same music.
We're also aware the arrow pointing at the DNA is a bit cryptic, it's indeed an indicator of what type of rats were spawning, this could be made a bit more clear.
I'll check out your game soon!
Vriendelijke groeten uit België en Nederland ;)