Got 95 connection with a 48 streak, I believe that's a good score?
The difficulty (time interval) seems to drop midgame. Like it slowly become more frequent and then suddenly it drops to very slow and then starts ramping up again.
Also I'd prefer if it connects when I release the mouse button instead of having to click on the second resident.
It also requires some good memory to play, like the hardest difficulty in my game. On that note, you can implement an easier level by just not hiding the resident image.
Overall a fun and addicting game to play. Good job, well done.