Thanks so much for giving it a play, and your feedback!
If I was to expand this game I'd probably work more on weaknesses/strengths of different enemy units and towers. For instance, the main one currently is that flying enemies are weak, but are speedy and can pass barriers and towers. I've got some ideas in mind, but being a jam I ran out of time unfortunately.
Everyone seems focused on the basic "build energy, use basic tower" strategy which is fine and to be expected... but I promise that there are much stronger deck builds that can be used! There's a Paisley x Tama deck that's nearly unstoppable, and only involves 3 units total on the map. I'm sure with experimentation there are many other strategies that could be deployed too.
As the developer, it's on me that the game doesn't encourage more experimentation... so definitely something I'll have to think about going forward! Thanks again for the feedback, it's very helpful!