This is such an adorable little game, and a pleasure to play. I was a little confused my first time through because I didn't register that I was getting points deducted for catching too many, and was like "...what's stopping me from just selecting the whole screen" LOL but that's on my adhd ass. Could be helpful to have the "0" score highlighted on the score count per level with a "Too many gubus! ):" message or something.
I did notice a little bug in the scoring system - if you restart the game without refreshing the page, every game after the first one counts you as having scared off bugus even on the levels (1, 2) where there aren't any/you didn't encounter any. I got "scores" of between 1-3 bugus scared off when I definitely hadn't seen any yet in that playthru lol.
Love this tho! Might be interesting to see the challenge go up by being told to catch X amount of Y type of bugu. They have such cute personalities, they deserve individual attention! Also loved the where's waldo visual effect of having to hunt down the bugus. Very good. Nice work!