I just discovered what the lags stem from. Basically once in a while I do a very memory-heavy operation. The kicker is, it's a leftover code, so I don't even need to do it since all it does is spawn in a bunch of inactive objects in a short time, and actual spawning of active objects is handled elsewhere in code (and in more efficient way). I'll update it post jam.
For sound design I figures less-is-more in a game like this. You get your feedback (on either getting money or hitting something), and you get your pumping soundtrack. That's it!
Enjoyable chaos was one of my goals, so I'm glad you enjoy it too!
Thanks for playing!