Bit over 13K points (if I remember correctly) and I do have to say that I enjoyed it, stayed a lot longer than I initially thought! Would have wished for more stuff though, like powers you'd get or that you'd be able to spend your points to buy some powers for example, so there would be a tradeoff between gathering as many points as possible, but having to spend them to get better and be able to beat other enemies (Like stronger ones if there were).
I did like it though and the atmosphere worked with the art work. First I didn't really realise why I would change world, since the enemies were as strong, gave as many points, but after I finished I read the description and realised that you can make it always a bit easier that way and realised why I ended up with massive amount of enemies spawning very fast, which I enjoyed though!