I was excited to give this another try since I haven't played it since a much earlier version and am happy to say I wasn't disappointed 👏 you have really upgraded it since then! It's very fun and I love the theme. Overall I think this is a great pinball game although I would classify myself as a pinball novice. The music, art, UI/UX, and sound design are wonderful. My high score was 713,621 using the strategy of trying to get all of the initial upgrades before further upgrading them. Also was super excited to get into the "bonus" area the few times I managed to get the lights all on! One last note would be that a couple of times when the Mochi Guardian saved my orb it just sort of shot it off the bottom of a flipper and I lost it anyway. I would say this is a bad thing because it doesn't feel good as a player but it might be the only way to keep that upgrade from being OP at higher upgrade levels especially.
Which flippers work better?
I honestly think they both felt equally responsive. The only note I would say was once with the upper flippers I hit the orb and it sort was a “dull” or “unresponsive” hit.
Are lvlups too fast?
For the pinball skill level I’m at I would say no they are at a good pace. I’m not sure what score/level you would have to hit to have maxed out all skills but it seems like you would have to be a fairly good player to hit that level.