Tower Defense lives on! My last jam game was a fresh take on tower defense too, I think this genre still has legs. Well, I do agree that the mouse sensitivity was too high and I kind of thought the tower placement was a little confusing at first because the tooltips flicker in fullscreen mode and I didn't see them at first. Ultimately minor stuff you could patch in a day. I think the way forward with this concept would be coming up with ways the two views could interact. For example, if you had towers that could freeze enemies in a group, then a gun that could fire a piercing line through multiple enemies, the player can start setting up amazing synergies. That's my advice! Otherwise a nice entry with lots of depth and potential!