Hi, we recently released a free prototype of our game: Robots vs Aliens - https://devgerry.itch.io/robots-vs-aliens
It's a tower defense highly inspired by the Plants vs Zombies series with a little twist in resource management. Your bots consume battery charge so you have to properly balance the activation of your defenses.
The game contains a tutorial + 6 levels and it's meant to show the basic principles around the game. It best runs on browser desktop. Mobile hasn't been tested well enough yet.
Any constructive feedback or comment would be super appreciated!