Is it okay if I mad a game that is based of a game on the appstore/Google play store?
People make copies of Doodle Jump, Minecraft, Mario, etc. all the time. As long as it's not for commercial purposes (making money, like maelstrom said) it should be fine. It might be advisable if you mention the name of this game in the credits or readme.txt.
Fire Emblem for TI 83/4+ Progress: Demo: 75% Total: 40% Postponed indefinitely
I made programs of Cookie Clicker, Flappy Bird, and 2048, and haven't gotten a lawsuit filed against me yet. So…yeah, as the others said, it's OK.
I would like to know, though, what exactly are you trying to port?
:ClrHome:Disp "HOW DOES A","MATHEMATICIAN","LOSE WEIGHT? :Pause " :Pause "BINOMIALS! :Pause "(BUY NO MEALS)":ClrHome