A small number of users have reported an issue with in-app purchases. Specifically it's been reported that Google's in-app purchase system SEEMS to be requesting additional payment when re-using previously purchased in-app content. Several of those users have also reported that no additional payment is ACTUALLY taken.
It's safe to download the app. Elite Systems Ltd designed Recreated ZX Spectrum that lies within the Arcade Games category. The game is suitable for users aged 14 and older, it has the average rating 2.7 on Google Play.
This application was downloaded and set up by over 10K users and its latest stable release was on Oct 15, 2015. Get the setup package of Recreated ZX Spectrum 2.0 that is provided for free and check out users' reviews on Droid Informer. The app is designed for Android 2.3 and higher.