I don't even do much stuff on this group, but I'll probably change the avatar monthly just for variation.

Sources of the original picture will be available on the group's description, along with a imgur album with the older avatars uploaded.

If it's an official artwork, then there will be no source.

Just that.

http://store.steampowered.com/app/392030

Murasaki is a bullethell game made by the same guy who did Irisu Syndrome / Demon King Chronicle / Love Mochi, etc.

This version includes English language and integration on Steam (cards, backgrounds, etc). The freeware version (still downloadable in the official website), includes only Japanese.