Bad rendering quality on mobile (HTML5 export)

Hi,

My game renders terribly on Android Chrome (HTML5 export), whereas it renders perfectly in other cases.

See for yourself. It looks both blurry and pixelated:

For reference, here is how it looks on Firefox on Linux:

And here is how it renders as a native Android app (on the same device):

I've done all the right things that I know (that is, not much):

• enabling filter and mipmaps for all images and fonts;
• disabling oversampling on dynamic fonts;
• using 2D stretch mode and keep aspect.

Other things that might help:

• I'm using Godot 3.5;
• my phone is a Samsung Galaxy J5;
• framerate is quite low as well (around 30 FPS).

Do you have any idea of what I could've done wrong?

Thank you in advance for your help .

CristianoSimao
My issue isn't related to the number of triangles I use, because even my title screen (which only contains a sprite and a button) renders at ~ 30 FPS.