Tied to the Beat just launched in Early Access.
It is an arena survivor built on lyrics. Every word that plays changes what happens on screen. FIRE rains flames, FREEZE locks enemies in place, DARK cuts your visibility down to almost nothing. Over a thousand words are wired to their own effect, and it works in 31 languages, so a Spanish song plays in Spanish and a Chinese song plays in Chinese.
You can also drop in any MP3 you own. The game transcribes it, times the lyrics and turns it into a playable level. That happens entirely on your machine and nothing is uploaded anywhere.
The engine is hand written in TypeScript and Pixi.js, no Unity and no Godot, which is why it holds 60 fps on a 2018 laptop with integrated graphics.
Trailer: https://www.youtube.com/watch?v=oxpyF88wK4E
Windows and Linux. 3.99 USD for the first two weeks, 20% off the regular 4.99.
https://lianes8.itch.io/tied-to-the-beat
There is a free demo on the same page if you want to try it first.