They aren't the best assets, but they are mine, and I'm planning on using them In the jam which is why I made them free for everyone else to use as well.
I Left them untextured partly because I'm waiting for the jam to start and find out the theme. Also with them not being textured it will allow anyone to texture it to suit the game they are making. Textures.com and TexureHaven (I think is now polyhaven) is my goto for textures
I'm pretty sure this is allowed as per rules, I have not started working on my game yet and have shared what I did do.