Periodicity - Hats and scars is part of the Festival of Danmaku-Games on Steam.
You can get the Wild West Bullet-Heaven game with a nice 69% discount.
This is the perfect time to check out the new 1.2.1 update.
Festival of Danmaku-Games on Steam
Need more information? Play the free DEMO
Periodicity - Hats and scars DEMO
Have fun