...okay, when I used the term "level up" I meant it rather metaphorically. There aren't going to be actual levels or experience points here. I was just using it as a metaphor to explain how everyone's gonna be starting out weak and slowly growing stronger based on participation.
That said, I have two criteria for whether a power is allowable. The first is whether it naturally lends itself to metagaming, which powers like telepathy really, really do. The second is whether or not another player could reasonably fight back against it (whether it lends itself to powergaming, essentially); an instant-kill power, for example, which is what the "max level" of your morto-kinesis sounds like, would definitely not be allowed. Amplification and nullification both sound acceptable.
Technically, anything could be used to 'instant kill' someone, the Joker used a pencil in The Dark Knight for example, but the difference is the possibility of dodging, missing, deflecting, etc. Does that make sense to everyone?