At the moment only Spanish and English are supported, with other languages coming down the pipe. However, there's no language select in game yet. This is a planned feature but I can't promise an specific date for it.
This is great so far. I really love the work done to this.
The only issues I noticed were these.
1. The blinking cursor at the end of every sentence when people talk is not a blinking cursor anymore. It's a blinking whatever is in the background block, instead of solid white.
I am assuming it is now transparent for some reason, and you can see through it instead of it being solid white. (This is just fine in the original v1.3, but is now ruined in v1.3.1 and v126.96.36.199)
2. The upscaled graphics are having some issues and look glitchy. (I prefer the original graphics, but I tried the upscaled, and they have some issues displaying properly at times, depending where you are)
(They mostly work in the original v1.3 and v188.8.131.52 after selecting upscaled graphics, then quitting and re-opening the game to refresh everything, but it's ruined in v1.3.1 even after quitting and re-opening the game)
(For some reason, trying to use upscaled graphics in v1.3.1, causes the graphic settings to get reset when restarting the game. They default back to original graphics, and protoanomaly colors)
Other than that, I love this so far and I hope that information helps with future updates and fixes.
Upscaled graphics are borked in 1.4, but I'm glad to see this project is still being worked on given what happened in 2020
EDIT: They only work properly in 852x480 & 1704x960 windowed modes if you boot with original graphics and toggle to upscaled, restarting with upscaled = broken backgrounds, if toggling between original and upscaled at any other screen mode then the ones mentioned above, you'll get different forms of broken sprites and backgrounds
EDIT 2: changing volume sliders doesn't stick after restart and music is way louder then SFX when trying the same % for both