I will say, this is why I love the JVM so much. Runs on everything, I can pull, compile and build this game easily without worrying about any kind of platform specific library issue unlike open source c++ games I've tried to compile
I have other reason why I love this being in Java, it makes the point that a fun game isn't about the language it is programmed on, rather the quality of its programming and the overall game design.
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.