I really love this game!! It's really simple: Punch other people outside the map :D!!
With this simple rule you have also some skill for example swith the position of the player who push and the pople has been pushed and bug jump :D
I really recommended this game :D! Fun guaranteed ** !!!
I never played S4League, but i am a REALLY lover of FPSArena (like Open Arena and Xonotic <3) and this Block League with its "TouchDown" mode is a very balanced and funny gamemode like a CTF with also the "Arrow-weapon" that allows you to do some Trick like big jumps and streaf :D
I REALLY recommend this lib because it helps and give a boost about the creation of a minigame in Minetest. There is also a "sampleminigame" Mod that you can use to try the lib and it could be a usefull template to start to create your first minigame!
I also would like to tell that there is a huge and detailed documentation that helps and guide you while coding the mod (in my case, all my questions found the solutions inside there)