While our artist created most of the models himself, we did use some from other creators and forgot to list them in the jam page: it's now been updated accordingly :)
We tried to make the game accessible to make sure everyone can get to the end of the story, and optional contacts were supposed to present more of a challenge...I'm sorry they weren't enough for you, but maybe we can fit harder puzzles in a post-jam update ? ;)
Thanks for all your feedback!