It's pretty easy to accidentally bump into another person whose costume you aren't trying to take, which can get frustrating. It would be nice if you had to press a button to take a costume, that way it couldn't be done accidentally. Nice sound effects. The game ramps up in speed towards the end nicely, too.
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I had thought about a key press, like you said, to change costumes, but after playtesting without it I rather enjoyed trying to avoid bumping into others by making sure to go around them. I understand that it can definitely be frustrating at times (especially when they are clumped together!) but I think it adds to the challenge.
I spent a while trying to figure out how to have the number of houses that light up increase nicely over time, glad you liked it :)