High score? The game ends up being rather cheesy - by leaving some balls behind your paddle, you can keep moving up/down and scoring those points. I'm not sure if this was intentional design; but it could indeed be leaned into. It ends up being a different game entirely.
I think this was rather well constructed. Perhaps try not having all the balls be the same "blob" - once the majority of the blob is across the screen, you're done for: and this is largely an inevitability. Maybe stop the balls off-screen from blobbing.
I had a couple physics bugs, unfortunately. Once, the balls spawned behind my paddle, and I couldn't hit them. This time, the two balls orbited around each other for a long time. I think that the tutorial was well-implemented, and the game looks great. I think when "no action is detected", it should probably impart some movement left/right to get it going again?