Idle Marble Breaker

I've been enjoying it, the only thing that annoys me is that there doesn't seem to be any way to unlock more slots to shoot more marbles, even though you can clearly see there are more slots, and the Races and Clash seem kinda unfair, I've only done each one twice and I was in a Clash with someone who's a level 9223 while I'm only a level 1693, and both the two races and the two clashes I've lost almost immediately, so that's kinda unfair imo, even if it says they're on your level or something