I'm happy you enjoyed it, and thanks for playing! Nice score, you made it to both endings!
Yes, this is made in my own game engine (written before the jam, and used in our game for last year). You can find the source code on my GitHub page. :)
Within the jam's time limit, 2FoamBoards spent a large amount of the time and effort drawing each of the five options we have for each of the five "layers" you can change. Sadly, the 3,125 possible combinations still exhibit visual repeats within the time limit! The human brain is too good at this! I think if we were to remake this game with more time, we could do something similar to the Mii Maker, where you can move elements around as well as changing them. However, I don't know how we would encourage the player to spend time customizing them with the current time limit and goal of getting as many humans on earth as possible... Good criticism, though I'm not sure how we could address it. 😅
eyy you found the placeholder images! We used them to make sure my layered sprite rendering code was working well, and I agree with you that they are too adorable to remove haha. The banana even made it into the final build!