First of all credits for the first texture mod goes to turtle dude#4438.

So you want to mod the textures in Battle Bears -1? GREAT because you can! All you need is one simple program called Unity Asset Bundle Extractor (UABE).
UABE Link: https://github.com/DerPopo/UABE
turtle dudes image: https://drive.google.com/file/d/1xbRseTdeeFYGPUmxpXJUpBaLT_ZpWkrY/view?usp=sharing

Once you have installed UABE, open it, click the file button on the top left and the click open. Navigate to your game directory and open the resources.assets file. UABE may ask you to choose a Unity version and if so just choose the most recent version available. Once in there scroll down until you find the texture you want to replace, for example the Enemies texture (for all regular non-zombie Huggables) and click on it and then click on Plugins on the right side. Once in that menu press "edit" and ok. Another menu will pop-up and there will be a button prompt called "load", click on that and select the image of choice. After that close UABE and it will ask you if you want to save, click yes and then it will create a new resources.assets file. Backup your original file by moving it elsewhere or renaming it. Put your new resources.assets file into the same place you found the original file. You're done! Now open the game and see your AMAZING texture mod!