So how much is the max score? Is there an end, or are we cursed to eternal bug-squashing?

There is an end! I think the hardest step is the one where fast black ants attack every two seconds. and after that if you're able to play for 30 more seconds, the princess will be saved.

I didn't put much thought into arranging/tuning the values, but you can take a look at the levels here: https://github.com/shajidhasan/shehzadi-in-peril/blob/main/g...