There are a lot of creative mods + abilities. That the Lua programming language is core to the engine, means it is easy to do all sorts of supported creative things with the engine. But some of the mechanics and 'smoothness' of play that you can get in Minecraft just isn't there yet in Minetest, due to how the network protocol works. Give it a shot, you can play a local world with very little effort, and if you know lua, look at some of the 'world' definition code.