They kind of hurt people's eyes apparently
Oh well, the fire and teleporter blocks still benefit from the bloom addition, as well as the star particles that glow even brighter now. I might find some other uses (giant star in the skybox? meteors?)
I think I found the solution : a brightness slider. I don't know how it's supposed to be done in other games, but here I just skew the colors upwards with the pow() function (with an exponent < 1).
And I needed this setting anyway.
So here's the same screenshot three times, with brightness 0/50/100 :
0 was the old default, 50 is the new one. I do think it looks clearer without changing too much the atmosphere.
The max brightness screenshot is pretty washed out, but some people might want to play like that, so eh. And if the ingame settings are not enough, you can edit the settings file with -50 or 250 as brightness. It'll look bad but it won't be my fault.
Edit : Gamma correction
, it is
a power law. Sweet.