I enjoyed the mechanic of deciding which enemies to collide with and then which side of the map you had to go to. Therefore, having to plan ahead to make sure you aren't going to get hit by anything.
I would suggest maybe a lower spawn rate right at the beginning so you can understand the mechanics better before actually speeding up the spawns a lot, as right at the beginning it can be a little hard to grasp the mechanics and understand why you keep dying.