MINEFALL
Minefall is a survival game. Its signature feature is the ability for players to "fly" if they have enough mana. Actually, the feature is called "levitation" and is a similar to "jetpacks" that one can find in other games. Another distinct feature is the use of ranged weapons (wands) that have various interesting effects.
The game has no particular goal, though a prerequisite is to survive because most mobs are hostile and dangerous, especially in numbers. However, the game has been designed so that players can specialize in fighting (PvE/PvP), trading, mining, exploration or building and farming.
Use seed 12341234 at world creation to spawn in "easy" location.
Although the game has been designed with multiplayer in mind, it is fairly playable alone. Some things are a lot easier, but on the other hand the player cannot rely on trade, so sometimes the player will have to wait for things to happen unless they manage their activities very well.
Do not install mods that are not designed for Minefall (there is not any at the moment).
It's insane, you can't take a break a while that the game yet spawns enemies all around you, wherever you go. Digging soft blocks is useless, they take too much to be dug and then anyway you lose before making a pillar to escape enemies or a simple protection all around you. To jump you use stamina, making escapes even harder. At least each punch could be damaging rather than missing. Enemies knock back on water (blue tarantulas for example) is so low that they follow you like if you're not punching them to push them away, moreover they can attack you as when running on blocks so you can just stand still, no difference.