It wasn’t on the Google Play Store. It wasn’t in the Chrome Web Store. It was a forbidden artifact: Minecraft’s Java Edition, rewritten in JavaScript, designed to run inside a browser with no installation, no admin password, no trace—if you knew where to look.
There are many forks (EaglercraftX 1.8, Eaglercraft 1.5.2, etc.). Some are stable, others are buggy. The “best” version changes monthly. Eaglercraft Download Chromebook