Very cool!  I love the sounds, the lighting, the noise, and the distortion underwater. I only see one theme though.
Overall I'm impressed.

My highscore is 46176!

Having just dumped multiple full paychecks into an expensive drone, the most reasonable thing to do now is to send it down a nightmarish sewer littered with entire construction pipes at a high velocity until it crashes.

This might be the most visually striking entry. And you even have sounds! Weaving the drone around the pipes was tight and very fun. All around, this is a level of polish that I did not anticipate when I signed up for this jam.

Impressive creation, to be made in only 4 hours!

Great visual effects, combined with the audio that makes it a very complete entry. Nice!

Not sure what exactly is going on, but I got a score 1727! Also big props for adding in audio! 

You can play the game with OperaGX on gx.games

https://gx.games/games/qiyvdz/sewer-level/

Have no Windows PC, only source code for now, sorry :(