The scrolling background looks very nice! The bugs look okay and pop out well from the background, but could maybe look a little "smoother". I like that the coins have a little bug drawn into them. The hazards could look a bit more menacing though, maybe have a red background instead of white or something, they kinda look like collectibles to me. The butterflies look good, but could pop out a bit more.
The music fits well with the aesthetics. Found (an unintended) bug though - if you die and restart, the old music keeps playing while a new one starts. The sound effects do a good job communicating the function of the things you bump into (coins sound like coins, hazards sound like "failures", butterflies sound like something extra good).
I thought the game would have three characters running on assembly lines or something like that, so the bug theme was unexpected. Overall, nice job improving on the base game!