Nice work. The basic tower defense mechanics are all there (Other than upgrading).
The second tower type seems a little underpowered at the moment. There's only two spots on the map where I feel like it performed better than the first type. So after a certain point I was basically just throwing type 1 turrets on every available space.
I feel like the overall game speed is a little too slow, and because you're adding more and more enemies with each round it takes progressively longer to finish each round. Would be good to have higher health pool enemies (With different visuals) that get added in as you get to higher levels.
Obviously there's some stuff missing like music, sfx, tower upgrades, different enemies, and so on, but I'm sure you realize that.
