I mean I hate to be picky, especially since I feel comraderie with my fellow Java game developers, but you listed this as Android-compatible which it doesn't appear to be. It's just a jar file. And the fact that it needs a separately downloaded manual just to know how to play feels really unpolished. I haven't even tried the game yet but the first impressions leave a lot to be desired.
EDIT: Finally played the game. The first impressions didn't get any better when it turned out that the default keyboard setting isn't QWERTY. I get that maybe you have a different keyboard layout, but you should really consider that the vast majority of your players are going to be using a QWERTY layout. Also, I don't know what technology you used, but I made my game in Java with JavaFX, and it's extremely easy to support different screen sizes and resolutions. My game runs both in full-screen and windowed modes, and can be freely resized. I'm sure LibGDX has the same kind of functionality. But considering the fact that JavaFX is bundled with the standard JRE by default, and most Java game code should at least consider supporting Android and all its various screen dimensions, there's really no reason a Java game shouldn't support resizing.
As far as gameplay, the game is reasonably fun, and you did better than most when it comes to actually building out levels and content.