I got a score of 28! Not sure if that's good, probably not but I had fun and that's what counts! I like the idea of slowly modifying the level over time. Maybe it could have changed even more dramatically. But it was cool like this. At first I didn't get what the point is of collecting the thingies but I just kinda accepted it until at some point it gave me my score and then I understood.
Would be even cooler if some kind of "new"-effect would show up on the newly spawned spikes so you can see what changed more easily. Like maybe they could blink or something.
Good work on the controls, it felt nice to play.