I like the model, but not the drawings. The drawings do not fit with the model, I would skip them and invent a new skin for the mouse.

Just to give an idea what I imagine:





http://www.puppenheim.org/
http://www.wuerfels-welt.de
Old Game Tutorial: http://www.puppenheim.org/MITutorial.zip
Free Game Editor: http://puppenheim.org/AlienalsWeihnachtsmann.zip
http://www.puppenheim.org/blender_starting_main_settings.txt