You can only buy the games here on itch.
Although AITA is always free and will always be free for all.
The L&B android is free as well but has no premium content, since I don't know how to package that.
https://twistedmoony.itch.io/lost-bound - project page for Lost & Bound
https://discord.gg/wpQpRSRG9f - Discord if you're not on there yet ;)