I really like the art.
Unfortunately I neither had someone to play with nor a gamepad so I think designing specifically for something like this is a bit of a limitation. However, I still played the tower defense mechanics as a single player.
The enemies move so quickly for most of the towers to do any damage, at least until the enemies stop by the end to deal damage,
All in all, I think the game needs some minor tweaking and it could be fun. Maybe I missed the idea bc of not having a player 2. but a good job nevertheless!