gog_ultima: https://www.tlkgames.com/

I found a company that fits the category of Developers selling DRM-free titles and having their own storefront.
I just recently did an order of 20 of their games. The installers that you download have zero DRM attached to them so they can be copied and stored however you want.

The games themselves are a bit more on the simple side but most of the titles are rather pleasant and you can download demo versions of any of the games they sell before you buy. Just be aware that the titles aren't the most graphically appealing or have the widest array of resolution options but the prices are very low.

gog_ultima: https://www.tlkgames.com/

Lifthrasil: https://shop.redcandlegames.com/

kbnrylaec: As of 13:00 on March 24th, 2021 (JST), you will no longer be able ton purchase games/content/etc. on the PLAYISM Store.Additionally, the My Page feature, from which you can redownload purchased games/content and reacquire Steam keys, are scheduled to also cease function after 13:00 on May 10th, 2021 (JST).Please be sure to properly make any necessary purchases and save any purchased content/post-purchase data/etc. as required before the above-listed dates.Please see here for details.

kbnrylaec: If you have games at PLAYISM, do not forget to redownload/reacquire your content or keys.

Slick_JMista: indie gala gives away a lot of drm free games for free in their giveaways. syberia 1 and 2 were recently added to the free list as well as some more AA titles.

freebies.indiegala.com

Kyousuke.: So playsim has died as a drm-free store? Sad news, especially considering that japanese companies and some devs are so obnoxious over drm.

B1tF1ghter: Yeah that's the thing.
Even if it had small selection of games the store had a very specific purpose and niche to fill - one that other stores don't fill so far - and that would be DRM-free PC gaming for JAPANESE indie games.
It's pretty infuriating that for some reason Playism stopped doing so :(

Kyousuke.: I wonder what pushed them to take that decision. Other than the already known controversies about GOG, many japanese games are region locked in japan, which is a problem for some japanese users (and only on GOG, as the steam version isn't region locked).

Zrevnur: There was something about Amazon AWS S3 (web storage hoster kind of, many webpages use some AWS stuff) doing something with some certificates at that date. So if they were planning on quitting anyway this may have been the reason to quit at that date. But I dont even know if they were in some way affected by this certificate thing.

B1tF1ghter: If that would be a real reason it would be a total BS.
If your storage provider does some BS you just announce your services will not be available for Z time because "you are changing your storage provider".
If your storage provider makes a fuss about your contract or does some other BS you then announce your services will be unavailable for Z time for "technical reasons".
You DON'T just QUIT for any of these reasons! That would be utter nonsense!

edit: changed one word for better clarity

Zrevnur: Did you even read what I wrote? I was suggesting a potential reason for picking the exact date to quit - not for quitting.