I do agree this is a unique tower defense game, a nice spin on the classic genre. It's pretty tough where it seems like you can get stuck and just killed very quickly on a single wrong turn. I really liked this game though and I'll have to spend some more time trying to get better to make it all the way to the end.
Some audio would really add a lot to this game and a way to quickly restart that first level immediately. Overall a great entry and great job!