Seems like a decent start to build from, so far. Looking forward to when it has a bit more content to it!
Minor notes:
-Scrolling with the scrollwheel is *way* too sensitive at the moment
-The ability to buy upgrades doesn't seem *quite* properly aligned with the resources you have - I was able to buy a 1.25 upgrade when I had 1.08 and it put me negative for a bit, and later I wasn't able to buy a 1.00 upgrade despite the resource counter showing I had exactly that much.
-For the future, some kind of 'buy for all balls' option might be a nice qol upgrade since personally I like to keep them even with each other
-It's a bit hard to read the text in the upgrade screen without zooming in, on PC
-Some kind of 'ball reset option' might be nice early on; my first nall got stuck bouncing left to right for a good two minutes with no way to do anything about it except let the bricks keep getting lower until it was able to hit them and bounce a different way
-The blue bricks don't seem to do anything different to the normal bricks as far as I can tell, some indication of how they're different would be nice
Best of luck going forward!