Anyone else got an increase of email spam from indiegala?

nope, the regular

I mailed their support but no answer whatsoever.

That doesn't sound like Indiegala at all.

I bought a bunch of bundles from them in the past and I can't remember the last time they sent me an email.

At least one mail a day. I've marked their email as junk so it automatically ends up in the junk folder.

1-2 email daily daily i dont buy anything there,i just use it for gameplay giveaway.

Cannot comment on recent but I just wanted to talk about my experience. I was signed up for giveaways years ago and bought a couple bundles. I was only getting maybe 1 mail a week. Later I was cleaning up accounts everywhere and they didn't have a delete account option, so I winded up at their support and they actually deleted my account. They were friendly I must say.