Very cute and very addicting! Congratulations on making this! :)
It feels very slow at the beginning, but as soon as crystal efficiency is unlocked, it suddenly becomes fast. You will certainly find better math there :)
Also connected to math: why not use whole numbers only? Probably is personal taste, but my brain did not approve of the decimals from the cost increase. With whole numbers you can also easily fix the digits jumping around.
But as others pointed out already: it has a nice atmosphere and i really enjoyed the shards flying around and not just clicking on one point the whole time :)