The Slimeking’s Tower, this is the premium version that usually sells for $4.99, on my device, it says free for the next 5 days (So ~June 4, 2020)
Magibot: normally retails for $4.49, free for next 7 days, (~June 6, 2020)
Not sure what the difference is between this and the Steam version, Steam version costs $12.99
Evertale, normally 0.99, free for next 7 days (~June 6, 2020)
I was just browsing on my phone and thought these freebies looked interesting.