Update: To the developer's surprise, Google has returned D-GLES to the Play Store. People who bought it in the past no longer need to send emails requesting updates, and those who have purchased the Amazon version will continue to get new releases going forward. The latest one adds support for Amazon Fire TV and the Fire TV Stick.
Doom took the gaming world by storm in the early 90s, so when developer id Software open sourced the game's code later in the decade, fans of the groundbreaking first-person shooter rushed to port the title to whichever platforms they wished.
Gamers in the mid-90s might remember spending hour upon terrifying hour playing Hexen: Beyond Heretic. The technology might have changed, but now you can get reacquainted with the realm of Cronos in this port from the same developer that brought us the Doom and Heretic ports. However, this game only comes with demo files – you have to provide the genuine article.
Hexen GLS is still the game you remember, but it's been cleaned up a little around the edges.
Kokak, the developer behind the Android port of Doom GLES, has brought another iconic game to Android devices everywhere, recently releasing Heretic GLES to Google's Play Store. As fans of old-school gaming would hope, Heretic GLES (like its Doom counterpart) supports physical controls on the Xperia Play or your keyboard or gamepad.
For those unfamiliar with the iconic FPS, Heretic challenges players to fight through hoards of undead monsters, find the gateway to Hell's Maw, and seal the portal through which the undead have sprung, going on to face off against D'Sparil who (along with two others) has been wreaking havoc by effectively disabling the seven kings of Parthoris.