Jumping adds a nice quirk to the VS gameplay, you could develop it in a lot of ways; hopefully more than just a timed invulnerability. I could see have two layers of enemies, so you also dodge air enemies, or even multiple levels of playing field where you go between them when overwhelmed. Longer hover times, etc.
The player is currently unkillable once you learn to jump and there's no scaling or power-ups so there's not much more to evaluate.
I'd be cool if the first time you play you slowly and inevitably get overwhelmed, time stops, and it just says press space, then the floodgates of possibility can open in the player's mind.
Congrats on making an Unreal game that doesn't tank my PC.