I'd like to give my kudos to the Mindustry developer because this game uses the same engine as the slay the spire but this game runs without a hitch, even when there is plenty happening while Slay the spire overheats my phone when I'm thinking what card to play next... -.-'
LibGDX is not so much a Java game engine as it is just a set of helper utilities and little libraries for building a game or engine out of. It is actually surprisingly efficient on the JVM, any inefficiencies will be built on higher levels above it.
