Grargar: If I understand correctly, the Play Store version has microtransactions for heroes and gemstones. In that case, I have found none of those in my Humble Android version. In fact, I can't even find anything in the menu pertaining to microtransactions.
Just check which permissions ask Humble apks during install. If there is no in-app purchases, then you dont have to pay anything.
BTW, 3 more games was added to Humble Android+PC bundle - The Shivah, the 2-D gothic action shooter, Savant - Ascent, and the homage to Amiga games of the 90s, Syder Arcade.
Shivah is good game, dunno about Savant, and Syder Arcade is great game with GREAT OST -check it out -
https://www.youtube.com/playlist?list=PLQXKbJCLKkQhN1f6Am9_4RDpZLYPsSsNy JMich: Week 2 unlocks:
The Shivah
Savant - Ascent
Syder Arcade
All available DRM-Free, Steam and Android, with Shivah lacking steam Mac and Linux options. All come with their soundtracks.
And Syder Arcade's OST is one freaking amazin one. Its actually very good game anyway, strongly recommend it.