This was a great game! Very easy and fun!
The graphics fit the game perfectly, the creativity was nice, and the gameplay was simplistic yet hooking. My gameplay was very peaceful, I got all the necessary bugs (I didn't get ALL the creatures, I wasn't planning too, but maybe sometime), and I had fun planning and picturing. And even the enemies (those vaccum flies) were very cute and I liked them.
I do have some issues though:
Firstly, the graphics kinda warbled around? I don't know if it's intentional, but sometimes some polygons look bigger than others and the textures don't line up at certain angles. It did create an interesting look though.
Secondly, a lack of a tutorial confused me. It was clear to take creatures and dump them into the pipe, but when I first played, I didn't know it was mandatory to get upgrades (Like the jump boost that you needed to get the flying creatures). If it was communicated on what the player needs, I think the first-time experience would have gone on much more smoothly.
Finally, I think the game lacked replayability. Being thrown into the same environment with the same requirements got boring over time. If a different gameplay lead to a different environment every time, with new creatures or different needs, I think it would've spiced the game a lot more and made it more refreshing to replay it.
Overall, I loved the game despite some confusion, and I think you did a very great job for a game made in such a short time. I would like some updates though!